Kolyma River
From Memory Alpha, the free Star Trek reference
The Kolyma River was a major river in the northeastern Union of Soviet Socialist Republics. The city of Srednekolymsk was located on the banks of this river. (TOS: "The Cage")
This river was identified on a political map of the North Pacific region. This map was accessed from the USS Enterprise library computer by the Talosians in 2254.
