|State||New South Wales|
|Regions||Sydney Basin (IBRA), Blue Mountains|
|Local government area||Wollondilly|
|Part of||Hawkesbury-Nepean catchment|
|- location||near Mount Armour|
|- elevation||676 m (2,218 ft)|
|Mouth||confluence with the Wollondilly River to form Lake Burragorang|
|- location||Yerranderie State Conservation Area|
|- elevation||118 m (387 ft)|
|Length||26 km (16 mi)|
|National parks||Nattai, Kanangra-Boyd|
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 metres (1,834 ft) over its 26-kilometre (16 mi) course.
- "Lake Burragorang subcatchment". Hawkesbury Nepean River Health Strategy. Hawkesbury Nepean Catchment Management Authority. 2008.
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