The river rises in the
Upper Kolyma Highlands, eastern limits of the
Chersky Range, at the confluence of Left Seymchan and Right Seymchan. It flows first in a northeast direction, bending along its course until it flows in a southeastern direction. Finally it meets the Kolyma near
Seymchan, from its mouth, downstream from the mouth of the
Buyunda on the opposite bank. Together with the Buyunda that flows roughly northwards on the other side of the Kolyma basin, the Seymchan forms the
Seymchan-Buyunda Depression, which limits the Upper Kolyma Highlands from the east. Its main tributaries are the Medvezhya and the Verina. ==See also==