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).
The largest tributaries of the Naryn River are: Kichi-Naryn River, At-Bashi River, On Archa River, Kadjyrty River, Chychkan River, Alabuga River, Kökömeren River etc.
The river contains many reservoirs which are important in the generation of hydroelectricity. The largest of these is the Toktogul Reservoir in Kyrgyzstan containing 19.9 cubic kilometres (16,100,000 acre·ft) of water. Dams downstream of the Toktogul in Kyrgyzstan include: Kurpsai, Tash-Kumyr, Shamaldysai and Uch-Kurgansk. Upstream of Toktogul in Kyrgyzstan is the Kambarata-2 and At-Bashi Dams while the Kambarata-1 and Kambarata-3 are in planning stages.
Some places along the river: Kyrgyzstan: Kara-Say , Naryn Province, Naryn, Dostuk, Jalal-Abad Province, Kazarman, Toktogul Reservoir, Kara-Köl, Tash-Kumyr.
Note : The above story is based on materials provided by Wikipedia