A river in the Amazon runs hot enough to cook anything — with no volcano nearby

Shanay-timpishka, a roughly 6km stretch of river in the Peruvian Amazon, reaches temperatures up to about 90°C — nowhere near any volcano. Geoscientist Andrés Ruzo began formally documenting it around 2011 after growing up hearing about it as family legend, and traced the heat to a non-volcanic source: rain and meltwater seep deep underground, get heated by the Earth's ordinary geothermal gradient, then rise back up through fault lines.

— Wikipedia contributors, Shanay-timpishka — Pastaza-Marañón basin, Peru