Ak-Suu (Syr Darya)

The Ak-Suu or Yokhsu/Oqsu (Ак-Суу, Ёхсу, Оқсу) is a left tributary of the Syr Darya, flowing through Batken Region of Kyrgyzstan and Sughd Region of Tajikistan. The river starts at Ay-Kul, in the north slopes of Turkestan Range in Sarkent State Nature Park. It flows into the river Syr Darya near the town Navkat in northern Tajikistan. The main settlements at the river are the village Ak-Suu in Kyrgyzstan and the town Navkat in Tajikistan.

It is 93 km long, and has a drainage basin of 1170 km2. Its average flow rate is 3.81 m3/s.