Seym (river)

The Seym or Seim (Сейм; Сейм) is a west-flowing river in Russia and Ukraine. Its length is 748 km (250 km within Ukraine) and its basin area about 27500 km2. It is the largest tributary of the Desna.

Places on the river are: Kursk, Kurchatov, Rylsk, Ukrainian border, Putyvl, Baturyn, junction with the Desna which continues west and south past Chernihiv to Kyiv.