| Seym | |
|---|---|
 Seym at Bupel in Kursk Oblast | |
 | |
| Native name | Сейм |
| Location | |
| Regions |  Russia:Belgorod,Kursk Ukraine:Sumy,Chernihiv |
| Physical characteristics | |
| Source | nearMorozovo |
| • coordinates | 51°09′50″N37°13′58″E / 51.16389°N 37.23278°E /51.16389; 37.23278 |
| Mouth | Desna |
• coordinates | 51°27′34″N32°33′50″E / 51.45944°N 32.56389°E /51.45944; 32.56389 |
| Length | 748 km (465 mi) |
| Basin size | 27,500 km2 (10,600 sq mi) |
| Discharge | |
| • average | 99.6 m³/s[1] |
| Basin features | |
| Progression | Desna→Dnieper→Dnieper–Bug estuary→Black Sea |
| Tributaries | |
| • left | Reut, Vyr |
| • right | Tuskar,Svapa, Kleven |
TheSeym orSeim (Russian:Сейм;Ukrainian:Сейм) is a river that flows westward inRussia andUkraine. It is 748 kilometres (465 mi) long (250 km within Ukraine) and its basin area about 27,500 square kilometres (10,600 sq mi). It is the largesttributary of theDesna.[2][3][1][4]
Places on the river includeKursk,Kurchatov,[citation needed]Rylsk,Glushkovo,[5]Putyvl,Baturyn, and the junction with the Desna, which continues west and south past Chernihiv to Kyiv.[citation needed]
In September 2024, during theRussian invasion of Ukraine, Ukrainian officials accused Russia of polluting the river by dumping sewage from a sugar factory inTyotkino,Kursk Oblast, resulting in environmental damage estimated at about Hr 186 million ($4.5 million) inChernihiv Oblast that included a decrease in oxygen levels andfish kills downstream.[6]
The river also serves cooling water for theKursk Nuclear Power Plant in Russia.
Media related toSejm River at Wikimedia Commons
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