Tonalli River

The Tonalli River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Blue Mountains region of New South Wales, Australia.

Course and features
The Tonalli River rises on the eastern alopes of Mount Marrup within the Tonalli Range in remote country within the Greater Blue Mountains Area World Heritage Site, and flows generally east southeast, east northeast, and then east southeast, before reaching its confluence with the Wollondilly River within Lake Burragorang in Yerranderie State Conservation Area. The river descends 559 m over its 26 km course.

The river flows through parts of the Nattai and Kanangra-Boyd national parks and is a source of water for the Sydney region.