The Tsna (in its upper part: Mokraya Vershina) is a river in the Tambov and Ryazan oblasts of Russia, a left tributary of the Moksha (Volga basin).

The name of the river (as well as the Oka tributary of the same name) is usually derived from the Baltic *tasna, comparing it with Prussian *tusnan "quiet".

[6] A calm, flat river, heavily regulated by dams, navigable in places from Tambov itself.

The list of inland waterways in Russia includes a section from the mouth to the village of Ten'siupino with a length of 47 km (2002).

On the bank of the Tsna River there is the Holy Spring, known in Tambov and the nearest regions, located in the village of Treguliai.

Below Morshansk, Tsna becomes wider, the current is faster, beaches with small, sometimes silty, sand appear.

Ten kilometers from the dam after the mouth of the Serp tributary on the right high bank is a pine forest.

Pine forest, reaching the river, there is also in front of the Rysly; Behind the village there is a floating bridge.

In Soviet times, the river was used for navigation, along the entire length of the shipping section from Tambov.