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'Sura' (, chuvash Сăр) is a river in Russia, a right tributary of the Volga River. 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.