Ak-Suu (Syr Darya)

The Ak-Suu () is a left tributary of the Syr Darya, flowing through Batken Province of Kyrgyzstan and Sughd Province of Tajikistan. The river is formed at the north slopes of Turkestan Range. It flows into the river Syr Darya near the town Nau in northern Tajikistan. The main settlements on the river are the village Ak-Suu in Kyrgyzstan and the town Nau in Tajikistan. 
It is long, and has a drainage basin of . Its average flow rate is .