The Naryn River (Kyrgyz: Нарын, Russian: Нарын) rises in the Tian Shan mountains in Kyrgyzstan, Central Asia, flowing west through the Fergana Valley into Uzbekistan. Here it merges with the Kara Darya River (near Namangan) to form the Syr Darya. It is 807 kilometres (501 mi) long (together with Chong-Naryn River) and has an annual flow of 13.7 cubic kilometres (11,100,000 acre·ft).