Shanaya Tipishca

The Shanay-timpishka, more popularly known as the "Boiling River of the Amazon", is a tributary of the Pachitea River, which subsequently flows into the Ucayali River, the main headstream of the Amazon River. It is one of the largest documented thermal rivers in the world; the entire river system is around , but only the lower is thermal. Its deepest point is around , and its widest is around .

At its headwaters, its temperatures are that of a typical jungle stream at around . As the stream flows over geologic fault-zones, hot geothermal waters rise from deep in the earth and increase the temperature greatly: the hottest temperature ever measured in the river was in a hot spring, while the hottest average river temperature ever recorded was nearly .