The Sura (Russian: Сура́, Chuvash: Сăр) is a river in Russia, a north-flowing right tributary of the Volga River. Its mouth on the Volga is about half way between Nizhny Novgorod and Kazan. It flows through Penza Oblast, Mordovia, Ulyanovsk Oblast, Chuvashia and Nizhny Novgorod Oblast. Its length is 841 km, it is navigable for 394 km from the mouth.
The city of Penza, and smaller towns Alatyr, Shumerlya, Yadrin lie along the Sura. At the confluence with the Volga there is a settlement of Vasilsursk.
The principal confluents of the Sura are the Penza River, the Pyana River, and the Alatyr River.
Coordinates: 56°07′21.33″N 45°58′16.54″E / 56.1225917°N 45.9712611°E