| Tonalli | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | Sydney Basin (IBRA), Blue Mountains |
| Subdivision Type5: | Local government area |
| Subdivision Name5: | Wollondilly |
| Length: | 26km (16miles) |
| Source1: | Tonalli Range |
| Source1 Location: | near Mount Armour |
| Source1 Elevation: | 676m (2,218feet) |
| Mouth: | confluence with the Wollondilly River to form Lake Burragorang |
| Mouth Location: | Yerranderie State Conservation Area |
| Mouth Elevation: | 118m (387feet) |
| River System: | Hawkesbury-Nepean catchment |
| Custom Label: | National parks |
| Custom Data: | Nattai, Kanangra-Boyd |
| Extra: | [1] |
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.
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 over its 26km (16miles) course.[1]
The river flows through parts of the Nattai and Kanangra-Boyd national parks and is a source of water for the Sydney region.[1]