The Desna (Russian language and ) is a river in Russia and Ukraine, a major left-tributary of the Dnieper. Its name in means "right hand". It has a length of , and its drainage basin covers . Десна, Great Soviet Encyclopedia.
In Ukraine, the river's width ranges from , with its average depth being . The mean annual discharge at its mouth is . The river freezes over from early December to early April, and is navigable from Novhorod-Siverskyi to its mouth, a length of about .
The water level of the river reached its lowest recorded point in 140 years in June 2020. This water level was 5 m (16 ft) below normal for that time of year.
After its confluence with the Seym near the Russian-Ukrainian border, the river then widens, splitting into numerous smaller branches. Its right bank declines again near the city of Chernihiv, and again near one of its tributaries, the Oster, where the Desna continues its course through a low, muddy plain until it finally reaches its mouth near Kyiv at the Dnieper River.
The Svensky Monastery is located at the confluence of the Desna and the Sven River.
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