The Vakhsh (/ˈvækʃ/ VAKSH; Tajik and Russian: Вахш), also known as the Surkhob (Tajik: Сурхоб) in north-central Tajikistan and as the Kyzyl-Suu (Kyrgyz: Кызыл-Суу) in Kyrgyzstan, is a Central Asian river and one of the main rivers of Tajikistan. It is a tributary of the Amu Darya river.