Tsna (Russian: Цна) is a river in Tambov Oblast and Ryazan Oblast of Russia, a left tributary of the Moksha River. 451 kilometers in length, it runs through the cities of Tambov and Morshansk. Tambov Oblast (Russian: ) is a federal subject of Russia (an oblast). ... Ryazan Oblast (Russian: ) is a federal subject of Russia (an oblast). ... A tributary (or affluent or confluent) is a contributory stream, a river that does not reach the sea, but joins another major river (a parent river), to which it contributes its waters, swelling its discharge. ... Moksha (Мо́кша) is a river in Russia, a right tributary of the Oka River. ... Image:Tambov1781. ... Morshansk (Russian: Моршанск) is a town in the Tambov Oblast in Russia, located on the Tsna River (Okas basin) some 93 km north of Tambov. ...