The Seim (also transcribed as Seym and Sejm, in ; ) is a west-flowing river in Russia and Ukraine. Its length is (250 km within Ukraine) and its basin area about . It is the largest tributary of the Desna. Places on the river are:

Kursk Kursk ( rus, Курск, p=ˈkursk) is a city and the administrative center of Kursk Oblast, Russia, located at the confluence of the Kur, Tuskar, and Seym rivers. The area around Kursk was the site of a turning point in the Soviet–German stru ...

, Kurchatov, Rylsk, Ukrainian border, Putyvl, Baturyn, junction with the Desna which continues west and south past Chernihiv to Kyiv.

References

{{Ukraine-river-stub Rivers of Belgorod Oblast Rivers of Kursk Oblast Rivers of Sumy Oblast Russia–Ukraine border