The Seym or Seim is a river that flows westward in Russia and Ukraine. It is 748 kilometres long and its basin area about 27,500 square kilometres. It is the largest tributary of the Desna.

Kurchatovsky District is an administrative and municipal district, one of the twenty-eight in Kursk Oblast, Russia. It is located in the center of the oblast. The area of the district is 678 square ki