The Ay (Bashkir: Әй, Russian: Ай) is a river in Bashkortostan and Chelyabinsk Oblast in Russia, a left tributary of the Ufa. The river is 549 kilometres (341 mi) long, and its drainage basin covers 15,000 square kilometres (5,800 sq mi). The Ay freezes up in late October or early November and remains icebound until mid-April. The cities of Zlatoust and Kusa are along the river Ay. Along the banks of the river, there are many steep cliff sides and caves. The current of the river has been used for hydroelectric power. It is also possible to fish for pike, bleak, and carp, to name a few species.
|Etymology||"month" or "moon" in Bashkir language|
|Native name||Әй (Bashkir)|
|Oblasts||Chelyabinsk Oblast, Republic of Bashkortostan|
|• location||Uraltau range|
|Length||549 km (341 mi)|
|Basin size||15,000 km2 (5,800 sq mi)|
|Progression||Ufa→ Belaya→ Kama→ Volga→ Caspian Sea|