Upa (river)

The Upa (Упа́, ) is a river in Tula Oblast, Russia, and one of the main tributaries of the Oka.

The river is 345 km long, and has a drainage basin of 9510 km2. The city of Tula is situated on its banks. The name of the river is of Baltic origin. This is probably one of the oldest baltic hydronims. Lithuanian word "upė", latvian word "upe" in english means "river", in russian means "река";