Astrum Space - This River Will Kill You in 10 Seconds | Astrum Earth

Episode Date: November 13, 2025

Forget everything you think you know about rivers. In this video, we’re diving into the weirdest waterways on Earth, including a river hot enough to boil you alive, a waterfall that bleeds, and a multi-coloured rainbow stream. Join us to uncover the mind-bending science behind these mysterious currents. ▀▀▀▀▀▀Astrum's newsletter has launched! Want to know what's happening in space? Sign up here: ⁠https://astrumspace.kit.com⁠A huge thanks to our Patreons who help make these videos possible. Sign-up here: ⁠https://bit.ly/4aiJZNF

Ambition comes in all shapes and sizes. At First Citizens Bank, we roll with your goals, because we're built for what you're building. Fit for your ambition, First Citizens Bank. If you thought rivers are just water flowing from point A to point B, think again. Some rivers shimmer like rainbows. Others boil like kettles. One flows backwards. Another is buried deep under sea ice, and one is legally a person.

These rivers are so beautifully unique. It's as if they've been painted onto our planet from Mother Nature's imagination. They are full of astonishing stories, jam-packed with mystery, and offer a glimpse of what Earth is capable of. I'm James Stewart and you're watching Astrom Earth. In this video, much like rivers themselves, will meander around the world. From jungles, the glaciers, deserts to cities, to find the strangest, wildest, most mind-bending rivers on earth. These aren't just rivers. These are nature's loopholes.

Our journey begins with the meeting of the waters in Manouse, Brazil. You may have seen the viral videos of two videos of two. starkly different colour groups of water meeting, creating a dividing line that would look striking in any painting. Here, the Rio Negro River and part of the Amazon River, also known as the Rio Solomois, come together to form something that looks like it shouldn't be able to happen. You would expect two rivers that meet to blend into one another, but that is not the case here. Robert Mead from the US Geological Survey described the contrast perfectly. One is a light brown cafe au lait colour converging with black tea coloured water

to produce the greatest hydrologic spectacle on the planet. What we are seeing here is a volume of water at least a dozen times greater than the total of the water falling over the Niagara, Igwasu and Victoria Falls combined. So how is it that two forces this powerful collide in such a picturesque manner? Well, the best part is they don't really collide at all. They flow together with this separation intact for around six kilometres. This fusion of light brown and black waters is so extreme it can be seen from space, resembling the famous Yin and Yang symbol from such a height.

The reason this happens is down to the chemical and physical makeup of each river. The Rio Negro, as the name implies, is a river of water that looks nearly black. It's actually the world's largest black water river and the largest tributary of the Amazon. Despite its dark appearance, however, it is actually relatively clear of sediment, but has obtained its tea-like colour from large quantities of plant matter, collected from the Colombian hills and interior jungles on its journey to Manouse. So deceptively clear is this river that visibility sometimes exceeds nine metres. And black rivers are often considered some of the cleanest natural waters in the world.

The water here has an average temperature of 28 degrees Celsius, much warmer than the solar moist, but flows much more slowly at around two kilometres per hour. The creamy Amazon, on the other hand, collects large amounts of sediments as it flows down from the Andes Mountains. As such, it's significantly denser than the clear organic rich waters of the Rio Negro, further adding in the ability for these two cousins to remain separate. The water is quite a bit cooler, too, at 22 degrees Celsius, and much faster than the Rio Negro, flowing at around 6 kilometres per hour.

All of these things, the difference in composition, acidity, flow rate, temperature and density prevent the two from mixing when they initially meet. Eventually though, the inevitable does finally happen and two become one. As the water encounters obstacles that form heavy eddies, the two rivers are reluctantly drawn together. This blending begins as the rivers flow downstream, aided by turbulence, wind, and the meanders of the river channel. Seasonal changes in water flow and sediment load can influence the mixing process,

which can take several kilometers to complete. Once mixed, the combined waters flow eastward as the Amazon River, the largest river by discharge volume in the world. 209,000 cubic meters per second goes into the Atlantic Ocean. To give you some context, the context, The Congo River, the world's second largest, discharges around five times less than that. An equally dramatic confluence can be found on the other side of the planet too.

Upstream from Lake Geneva in Switzerland, something wonderful happens where two rivers from two countries collide. Where the Rhone and Arv rivers meet, a beautiful turquoise river charges into a murky waterway, set against the backdrop of elegant green foliage, with the Geneva skyline poking through in the distance. As with Brazil, this intriguing contrast happens largely because of what the rivers have carried along during their respective voyages. The Arve River is one of the most powerful rivers in France, and it moves so quickly that it stirs up sand and muds, which give it that milky white hue. The Rhone River, on the other hand, starts in the Swiss Alps and eventually ends up in the Mediterranean. It's the only major river that flows directly to the Mediterranean Sea and is thoroughly alpine in character and colour. In this case, the two rivers blend into one another at a far more visible point.

So visible, it even has a name, La Joccheon, a location on the western side of Geneva. Similarly to Manouse, this confluence is also visible from space, as the colours of the sediment-laden of, and the milky blue roan show off their vibrancy from planet's earth. Sticking with the theme of colour, it's time to move on from these grey scales, something a little more vibrant. We head to South America for a rainbow-coloured waterway like no other. Every year in the remote wilderness of Colombia, an ordinary river erupts into a spectacular rainbow-colored explosion. Located 170 kilometres south of Bogota, three diverse ecosystems. The rocky Andes Mountains, the sweeping Larnos plains and the lush Amazonian jungle converge converge in the remote wilderness of Central Columbia's Sierra de la Macarena National Park.

Located within a biodiverse and beautiful region, deep in the southern fringes of Guadjabero River, lies Canio Cristales. This extraordinary natural wonder stretches for over 100 kilometers and consists of crystal clear waterfalls, rivers and streams. that burst into a vibrant array of colours for several months every year, creating a spectacle that surpasses even the most imaginative expectations. Canyo Cretales is often called the River of Five Colors, or the Liquid Rainbow. And according to local legend, it escaped paradise to flow through the earth, which when you look at it feels like a fitting tribute. The vibrant kaleidoscope of colours in the river, typically visible from June to November,

are not due to magic or supernatural events, despite their ethereal appearance. Instead, this striking phenomenon originates from a distinctly biological process occurring within the river itself. It's all down to a rare endemic plant called macarena clavigerra. a species of the riverweed family Podostomaciye covering the canio-crythales rocky riverbed. For much of the year, this moss-like growth appears in a muted green hue, nonchalant and unremarkable. But when the rainy season returns and the water level rises, and just the right amount of sunlight penetrates the river's floor, the plant erupts in a vibrant spectrum of purples, fuchs, fuchs,

reds, yellows and greens. This display blankets the riverbed and in doing so creates one of the most unique ecosystems the world is capable of dreaming up. Want more magic? Well, it gets better still because if you're fortunate enough to visit this river, you will never see the same colour variation more than once.

This unique ecosystem transforms with each passing season, much like the change in colours of autumn leaves. The growth and hue of the macarena clavigerra plants within the river are dictated by the year's rainfall, temperature and sunlight. Consequently, a section of the river that might be a vibrant crimson one year could display bright green or yellow tones the following year. It's not just the plants that give this river its rainbow hues, however. The stones where this aquatic plant takes root are likely the crucial factor enabling its survival and ability to flourish.

Canyo Cristalis travels atop the Gaiana Shield, a 1.7 billion-year-old rock formation that stretches across much of north-east and South America and is among the oldest geological formations on the planet. Once ancient rivers deposited sediment, this area became exceptionally rich in phosphorus, iron, quartz and other minerals. This mineral-rich bedrock now dips below ground and reappears in central Colombia, uniquely providing the ideal habitat for macarena clavigeria. Perhaps the most intriguing part about this majestic rainbow of colour is that it remained largely unknown to most Colombians. That is until quite recently.

For much of the 20th century, ongoing conflict between the government, drug traffickers and the local militia made this remote wilderness extremely dangerous, leading to its closure to the public from 1989 to 2009. However, in 1989, Colombian journalist Andreas Hedado Garcia bravely ventured through the guerrilla-held jungle with a camera, reportedly hiding from rebels in a peasant's home. He reached the vibrant river and captured its beauty on film, thus introducing this natural wonder to Colombia and the entire world. He told El-Tienpo newspaper at the time that it was the most beautiful river in the world. And he may well be right. Today the area is free from militia and thousands flocked to this river on a daily basis. But the colour of our next river should,

be enough warning not to get too close. For tens of miles in southwestern Spain, there's a river that runs a remarkable shade of red, and is so extraterrestrial it may even offer clues to life on Mars. From the Sierra Moreno Mountains in Andalusia, you wouldn't notice anything unusual about the Rio Tinto River. It's fairly unremarkable. But over a 50-crayna. kilometer stretch near the town of Niebla, an hours drive west of Seville. This seemingly ordinary waterway transforms into a surreal orange-ish, a rust-red hue that looks like it was ripped from a Martian sci-fi film, something Darth Vader himself would be proud of. The Rio Tinto, or Stained River in Spanish, owes its unusual characteristics to the sulfide ore deposits

prevalent in its region, a geological legacy of ancient volcanic activity. Over time, the exposure of metals within these deposits to water and oxygen has resulted in acidic runoff contaminating local waterways. This acidic environment, though detrimental to most life forms, paradoxically fosters thriving colonies of sulphide-consuming bacteria and other extremophiles, which further acidify the The distinctive reddish colour of the Rio Tinto is a consequence of these organisms producing ferric iron, a rust-like substance. Chemical weathering and bacterial activity have significantly lowered the Rio Tinto's pH to an average of two, similar to vinegar. This natural acidification has likely been intensified by millennia of mining. Humans have sporadically mined the area for nearly 5,000.

years, and the region is known among archaeologists as a key site during the copper and bronze ages. Even today, the digging for copper and other minerals continues, after having been temporarily decommissioned in 2001. The result is increased exposure to sulphide ore, making the river's water highly acidic and giving it that devilish tone. Interest in the river stretches right up to the present day, with astrobiologists, especially in the river. interested in the Rio Tinto due to its soil similarities to Martian terrain. The presence of iron and potassium-rich sulfate mineral Jarocytes, common around the river and on Mars, is particularly notable. Given that Jarosite and other minerals in this Spanish region often

show signs of bacterial activity, scientists believe studying extremophiles inhabiting the Rio Tinto could provide insights into searching for evidence of life on Mars. We'll leave that to the main Astrum channel to investigate, because we're sticking to our red theme and heading to Antarctica. There, we find a crimson waterfall forged from a weird quirk of geochemistry. It looks like the scene of a heinous crime. Blood-red splattering set against the bright white Antarctic ice makes for gruesome, if not compulsive viewing on the surface. But like all good crime scenes, it's what's buried deep below. that is most compelling. It appears as though the Taylor Glacier in East Antarctica is badly

wounded, as thick red liquid pulses out of it creating what is known as the blood falls. However, deep below the surface inside the glacier, things aren't as gruesome as they appear above. In fact, they're quite beautiful. The glacier gets its name from geographer and explorer Thomas Griffith Taylor. who first documented the area in 1911. Giving his name boat to the glacier, he found spewing out red water and to Taylor Valley, into which the glacier flows. Taylor also gave us the reason as to why the water ran red.

It was due to red algae, he mused. To stick to our crime analogy, this case still have many suspects and lines of questioning to pursue after its discovery. Where did that water come from? and was red algae really to blame for its bold coloration? The questions remained for nearly a century, until a new study in the Journal of Glaciology finally provided some answers.

Imaging from underneath the glacier helped solve the mystery, revealing a complex network of subglacial rivers and a subglacial lake below the glacier. That in itself was a pretty mind-blowing thing to uncover, but what's more is those really mind-blowing thing to uncover, But what's more is those rivers were all filled with brine, high in iron. The brine appears to have been almost injected into the ice and force up through cracks created by immense pressure over time.

The brine that falls through the cracks, loaded with that iron, reacts with oxygen in the air when the water emerges from the glacier, staining it a bloody crimson colour and forming the blood falls. And so, geochemistry solved the mystery. But the revelations don't stop there. What makes this case especially interesting is how the water flows. Surely in Antarctica, a flowing river shouldn't be possible, right? How does it not just freeze instantly?

Well, the answer lies in the properties of brine itself, because the team discovered that the lake under the glacier had an unusually salty consistency. Now, because salt water has a lower freezing point than the melt water from the glacier itself and releases heat as it freezes, it actually melts the ice, enabling the rivers to flow and the blood falls to erupt from them. As such, this actually makes the Taylor Glacier, the coldest glacier on Earth, to feature constantly flowing water. That's according to Aaron Petit,

a professor in the College of Earth, Ocean and Atmospheric Sciences at Oregon State University, which is pretty insane. As we leave one of the coldest rivers in the world, our next river could not be more different. Imagine a river so hot it could melt human flesh. Imagine hearing stories of a river so deadly that it boiled like a pan on a stove. And the only clues to its whereabouts were huge, plumes of steam bellowing into the Peruvian skies. The Boiling River, also known as the Shanei Timp Ishka, is part of a tributary in east

central Peru that connects to the mighty Amazon River. To many locals, it was the stuff of legend, capturing the imagination of a nation, and perking the ears of a young man called Andreas Rousseau, who was captivated by the stories of a Boiling River somewhere in his homeland. Years later in 2011, that young man followed his dreams and became a geoscientist, spending much of his time working on a thermal map of Peru. While some people search for buried treasure for Rousseau, the prize was something greater, the location of the mysterious Boiling River.

Documenting the journey in National Geographic, Rousseau described traveling to hours by car from Poucalpa, the largest city in the central Peruvian Amazon, followed by 30 to 40 minutes in a motorized canoe, followed by more than an hour of hiking just to get to where he thought the boiling river must be. All of this hard work led him to a remote patch of the Amazon, populated only by exotic white-throated toucans, jaguars, and indigenous tribes with a rich shamanic culture, to see if the myth was true. After years of hard work, research, searching and adventures, his patience was rewarded.

There, amid the dense central Peruvian Amazon, over 400 miles from the nearest volcano, was his prize. The boiling river. A flowing four-mile-long river, as wide as a two-lane road, and up to 16 feet deep, But most startling of all was its temperature, averaging 85 degrees Celsius, hot enough to inflict serious injury and hot enough to cook a small animal in seconds.

Local communities were likely more than aware of the thermal river for a long time, but until 2011 it remained unstudied by scientists. In uncovering the river itself, Rousseau also uncovered its geothermal secrets, finding what is believed to be, one of the world's largest thermal rivers, made particularly unique because its heat source is not volcanic activity. Typically, warm waters like this are associated with geothermal hot springs powered by underground volcanic activity. Yet the Amazon rainforest is marked by a clear lack of volcanoes. So where does that heat come from? This weird geothermal anomaly is over 700 kilometres away from the nearest. active volcanic centre in the middle of a sedimentary basin.

So what's the secret? The boiling river gets its heat from fault-fed hot springs. The key is what's happening deep below the river, where that water sinks down deep. Whilst underground, it absorbs large quantities of heat from the earth, and then it's pushed back up towards the surface, where it shoots through faults and cracks in the earth's surface, creating a boiling hot river in the middle of the Peruvian jungle.

In fact, this is so unique, Rousseau believes there's no other thermal river of this magnitude, anywhere else on earth. Each river on this list might be weird, but each one or two or three always flows in one direction, even the boiling one. So what about a river that changes direction twice a year? For that, we have to head to Cambodia, to find a river that flows both ways. Cambodia is located on the fish-rich Mekong Delta, and its capital, Pernon-N-Pen, is in the rather unique position of sitting right at the confluence of the Mekong and the Tonle-Sap rivers. The latter river acts as a lifeline for over a million Cambodians who get their food from and make a living of Southeast Asia's largest fresh body of water. If being the most productive inland fishing river on the planet wasn't

impressive enough, the Tomlaysap river is also one of the world's only waterways which runs in both directions. Yes, you heard me right. Its flow of water quite literally turns around and reverses every six months. This incredible feat causes the lake to swell by up to five times its size between the wet and dry seasons. And it's those seasons which lead to this peculiar phenomenon. So much of life in Southeast Asia is dictated by the monsoon season, which brings winds from the southwest every year, heralding the start of the rainy season, roughly between May and October. This huge influx of water causes the infamous Mekong River to swell so much that the Tonle Sap River is actually forced to flow backward. It is pushed back northward away from the sea as the

mighty Mekong dominates with its newly acquired water. In a very one-sided tussle, the expanse of the Mekong comes at the cost of the Tonle sap, which retreats backwards and becomes the only river in the world, therefore that goes both ways. By October as the monsoon ceases, the flow and the Mekong finally begins to lose its power as its waters make their way through the delta into the sea and it begins to fall. This reduction in water finally takes the pressure off the Tonle-Sap River and it reverses its flow once again. But there's no reversing or backing out of this next river. It might be the most contentious on this entire list. In a video about the world's weirdest rivers, there are some that would argue a

river that has legal personhood, i.e. the same legal rights as humans, isn't weird at all and should actually be the norm. Others might disagree entirely and find this concept perplexing for something that is just a body of water. Either way, I'll let you decide what you think in the comments whilst we visit the wonderful Wanganui River in New Zealand. The Wanganui River is a vital 290km waterway in New Zealand's North Island, originating on Mount Tongoriro's northwestern slopes. It flows through verdant hills and mountains before reaching the Tasman Sea. In 2017, the Wanganui River became the first river in the world to be granted legal personhood through the Te'ahuapua Act.

This legislation recognises the river as an indivisible and living whole, reflecting Māori beliefs that seize the river as an ancestor. The law essentially establishes the river's rights, powers, duties and liabilities, making them equivalent to those of a legal person. The decision sent waves across the globe. The native Wanganui tribes have long nurtured a deep connection with the waterway. American law professor Christopher D. Stone argued in his book, Should trees have standing,

for the independent recognition of environmental interests separate from human concerns. Drawing inspiration from his work, Maori scholars James Morris and Jacinta Ruru argued in giving voice to rivers for the legal personhood of New Zealand waterways. This concept has president in New Zealand, Wete Uweweira National Park and Mount Taranaki, a volcano sacred to the Maori, were also granted legal personhood. 2017 decision which recognised the Wanganui River as a legal person proved particularly impactful, blazing a trail for similar decisions across the world, granting legal rights to the Ganges and Yamuna rivers in India,

and all rivers in Bangladesh, although the Indian ruling was later reversed. Things get pretty murky when it comes to water quality and damage, especially given that now that legally constitutes an attack against the community too. Despite New Zealand's clean, green image, like pretty much every other place on Earth, reports indicate significant water quality problems in many of its rivers. Data from the National Institute of Water and Atmospheric Research reveals frequent and severe contamination of the lower Wanganui River, with faecal bacteria and fine sediment,

stemming from extensive farming on its steep slopes and those of its tributaries. The 1970s saw the implementation of hydropower on the, the Wanganui River too. A scheme whose continued operation is reliant on the now legally protected water. While the power company that runs the hydropower station only utilizes 7% of the river's total flow, it generates nearly 4% of New Zealand's power. Under this new legislation, however, for the indigenous tribes who hold the Wanganui River's sacred, this water diversion inflicts environmental, cultural and spiritual harm, and they strongly, oppose the extraction of their river's water. It becomes confusing when although this new

legislation grants the river certain rights, it does not override existing laws, including the consent allowing the hydropower company to divert water for hydroelectric power until 2039. This highlights the ongoing tension between renewable energy generation and the environmental and cultural preservation of a significant natural resource. It is a delicate balance. Let us know in the comments what you think about natural features like rivers being granted legal personhood. Do you think this is a positive thing or does it create more problems? I wanted to finish up with a river so weird that A, it doesn't have a name and B, its inner place, I wrongly assumed, was incapable of even having one.

Imagine a river so massive it stretches longer than the river Thames. yet it's completely concealed beneath piles of Antarctic ice. Scientists from Imperial College London have unveiled a subglacial river system beneath the Antarctic ice sheet, draining an area comparable in size to Germany and France combined. In 2022, a 460km-long river was found hidden beneath the ice flowing in to the Weddell Sin. Excitingly, it may be the key to unlocking even more, says Martin Seaggart, at Imperial College London, who was part of the team that found the river. Using computer models and real-world data, scientists discovered the vast branching river systems

hidden beneath the ice in Antarctica. These systems carry huge amounts of fresh water, around 24 cubic metres per second, in one of the systems, at very high pressure. The river isn't just there to look nice, and for us to marvel at. It actually plays a vital role in the movement of the ice above it. The high pressure of the water causes the ice on the surface to flow faster. When these rivers exit the ice sheet, they dump large volumes of water into the ocean,

which appears to cause significant melting of the ice shelves from below. Ice shelves are crucial for holding back the main ice sheet. Even small changes in these underground channels can affect the water pressure and depth in the surrounding areas up to 100 kilometres away. This means that changes far inland can also impact coastal ice too. In short, the hidden rivers under Antarctica are super important for ice flow and melting, and we need to understand them better to predict future sea level rise accurately. There are also potential feedback loops that would accelerate ice loss.

For example, if the ice starts to flow faster as water accumulates at the base, then this will increase friction where the ice runs over dry land, which could increase the amount of basal melting and water produced. This discovery, for a river still yet to be named, is likely the first of many more, and could prove vital in understanding our changing planet in the future. From rivers that boil, rainbow explosions of colour,

and even a river that has the same legal rights as you. Hopefully we've shown that there's far more to rivers than just a route to the ocean. They challenge our science, echo ancient beliefs, and remind us that Earth is far more magical and mysterious than we often realise. Were any of these rivers new to you, I squeeze as many as I could in, but please let me know if there's one that you'd like to have seen included here. And if you're screaming at the screen saying, underwater rivers, by the way, I hear you. Actually, we love underwater rivers so much. We've already made an entire video, about brine paws which you can check out on the channel.

I look forward to your suggestions and I hope that the next time you see a river, you don't just ask where it goes. You ask what secrets it might be hiding.