The Vakhsh, also known as the Surkhob, in north-central Tajikistan, and the Kyzyl-Suu, in Kyrgyzstan, is a Central Asian river, and one of the main rivers of Tajikistan. It is a tributary of the Amu Darya river.

Tajikistan, officially the Republic of Tajikistan, is a landlocked country in Central Asia. Dushanbe is the capital and most populous city. Tajikistan is bordered by Afghanistan to the south, Uzbekistan to the west, Kyrgyzstan to the north, and China to the east. It is separated from Pakistan by Afghanistan's Wakhan Corridor.