Upa
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Perciformes - Perches
Salmoniformes - Salmons and Trouts
Esociformes - Pikes
Siluriformes - Catfishes
Cypriniformes - Carps
Acipenseriformes - Sturgeons and Paddlefish
Mugiliformes - Mullets
Anguilliformes - Eels and morays
Gasterosteiformes - Sticklebacks
Gobiiformes - Gobies
Atheriniformes - Silversides
Perciformes - Perches
Salmoniformes - Salmons and Trouts
Esociformes - Pikes
Siluriformes - Catfishes
Cypriniformes - Carps
Acipenseriformes - Sturgeons and Paddlefish
Mugiliformes - Mullets
Anguilliformes - Eels and morays
Gasterosteiformes - Sticklebacks
Gobiiformes - Gobies
Atheriniformes - Silversides
The Upa (Russian: Упа́) is a river in Tula Oblast, Russia, and one of the main tributaries of the Oka.
The river is 345 kilometres long, and has a drainage basin of 9,510 square kilometres . 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.