The Alatyr (Russian: Алатырь, IPA:[ɐˈɫatɨrʲ]) is a river in Mordovia, Russia, and it is the left tributary of the river Sura.[1] It is 296 kilometres (184 mi) long, and has a drainage basin of 11,200 square kilometres (4,300 sq mi).[2] The Alatyr freezes up in November and stays icebound until April. The towns of Ardatov and Alatyr (Erzya: Ратор, Rator), are located on the Alatyr River.[3]