Kharkiv (river)
The Kharkiv or Kharkov (, ) is a river in Kharkiv Oblast, Ukraine, a left tributary of the Lopan. It originates from the town of Oktyabrsky in Belgorod Oblast, Russia and it falls into Lopan in the city of Kharkiv. The river Kharkiv may have given the city of Kharkiv its name. The river is also known as a place for people who enjoy cold-water swimming known as "morzhei" or "walruses" to swim.