The Ak-Suu or Yokhsu/Oqsu (Kyrgyz: Ак-Суу, Tajik: 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.

[1] 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.

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