Seymchan is an urban locality and the administrative center of Srednekansky District of Magadan Oblast, Russia. Population: 2,818 ; 3,725 ; 9,963. Seymchan is located in the Seymchan-Buyunda Depression, which limits the Upper Kolyma Highlands from the east. The town lies on the right bank of the Seymchan River, near its confluenc…Seymchan is an urban locality and the administrative center of Srednekansky District of Magadan Oblast, Russia. Population: 2,818 ; 3,725 ; 9,963. Seymchan is located in the Seymchan-Buyunda Depression, which limits the Upper Kolyma Highlands from the east. The town lies on the right bank of the Seymchan River, near its confluence with the Kolyma, about 350 kilometers north of Magadan.