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Shanay-Timpishka, known as Peru’s Boiling River, is a geothermal river in the Peruvian Amazon rainforest—not the Amazon River itself. Its hottest measured springs approach 100°C, hot enough to kill animals that fall into them. But temperatures vary, and the entire river is not continuously boiling.
Does the Amazon really have a boiling river?
There is a real Boiling River in the Amazon rainforest, but it is a distinct waterway named Shanay-Timpishka, not the Amazon River mainstem. Peru’s state news agency Agencia Andina places it in Puerto Inca province, Huánuco department, and identifies it as a tributary of the Pachitea River. The agency reported 6.24 km of hot reaches in January 2025 (Agencia Andina).
Published descriptions give different lengths: some refer to a 6–6.2 km thermal stretch, while others call the broader waterway 9 km long. The figures likely count different extents; they should not be treated as competing exact measurements of the same section.
The local Asháninka name Shanay-Timpishka is translated by Feeley and colleagues as “boiled by the heat of the sun.” That is the name’s meaning, not the scientific explanation for the heat.
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How hot is the Boiling River in Peru?
The river’s temperature changes from place to place. A December 2025 article by Feeley and colleagues says hot groundwater raises water to 95°C in some locations (Frontiers for Young Minds). A Xylem/YSI feature published around 2024 attributes more detailed field readings to geoscientist Andrés Ruzo: average temperatures of about 90°C in steaming stretches, 94–97°C at a site called La Bomba, and 99.1°C at a spring roughly 300 m downstream (Xylem/YSI).
| Reported location or description | Temperature | Source and qualification |
|---|---|---|
| Steaming stretches | About 90°C on average | Attributed to Ruzo by Xylem/YSI, circa 2024 |
| La Bomba | 94–97°C | Attributed to Ruzo by Xylem/YSI, circa 2024 |
| Spring roughly 300 m downstream | 99.1°C | Attributed to Ruzo by Xylem/YSI, circa 2024 |
| Some locations in the river | Up to 95°C | Feeley and colleagues, 2025 |
The detailed readings above are reported by a manufacturer feature, rather than a primary measurement paper. Xylem/YSI notes that water boils at 100°C at sea level. The river’s common name describes its extraordinary heat and steaming or bubbling reaches; it does not mean every section is at a rolling boil.
What makes the Shanay-Timpishka so hot?
The likely source is geothermal groundwater rising from deep underground. Feeley and colleagues describe hot water flowing up into the river. Xylem/YSI says the nearest active volcano is about 700 km away and presents Ruzo’s explanation: water circulates deep through the Earth, is heated by surrounding rock, and returns toward the surface along faults. The evidence therefore points to underground geothermal circulation, not sunlight or a nearby volcano.
Can animals survive falling into the Boiling River?
Animals that fall into the hottest reaches can die from the heat. A March 29, 2026 Discover Wildlife feature reports incidents involving frogs and rodents and attributes observations to Ruzo (Discover Wildlife). These are reported encounters, not a controlled wildlife study: the available account does not establish how many animals die, how often incidents occur, or what proportion of the river is lethal.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe hottest water is also dangerous to people. A fall into a near-boiling spring or reach could cause fatal harm; the reports cited here do not provide current visitor access information or practical safety guidance. Local use of some river water for cooking or cleaning, mentioned in the wildlife feature, should not be taken as a safety endorsement for visitors.
What does the river reveal about rainforest trees?
The steep local temperature gradient gives researchers a way to examine how nearby forest communities differ across warmer and cooler conditions. In a December 2025 article, Feeley and colleagues describe sampling 70 plots, where average air temperatures ranged from about 24.0°C to 26.5°C. The team counted, measured, and identified more than 600 trees representing nearly 200 species.
- The article reports more than 10% fewer tree species per 1°C increase in average air temperature across the studied plots.
- The hottest plots had 33% fewer types of trees than cooler plots about 2 km away.
These are findings from forest plots around Shanay-Timpishka, not a measured rate of biodiversity loss across the Amazon. The river system is a natural setting for studying temperature differences, not a controlled experiment or a universal forecast of how climate change will affect every tropical forest.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Further reading
For an account of Ruzo’s exploration, Xylem/YSI identifies his book as The Boiling River: Adventure and Discovery in the Amazon. It also quotes him saying, “There is a moral obligation to science.”
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