The Tungir is a river in Transbaikalia, East Siberia, Russian Federation. It is the third largest tributary of the Olyokma in terms of length and area of its basin. The river is 500 kilometres (310 mi) long and has a drainage basin of 14,700 square kilometres (5,700 sq mi). The Tungir is known as the Shiroky Brook in its uppermost stretch. Almost all of its basin is in the Olyokma-Stanovik Highlands area.