The Bolshaya Pera (Russian: Большая Пера, also Большая Пёра Bolshaya Pyora)[1] is a river in Amur Oblast, Russia. It is a right tributary of the Zeya. It begins on the Amur–Zeya Plain northwest of the mountains it flows through the town of Shimanovsk and the Vostochny Cosmodrome. It flows into a branch of the Zeya near Svobodny. It is 145 kilometres (90 mi) long, and has a drainage basin of 4,400 square kilometres (1,700 sq mi).[2] Its main tributaries are Dzhatva (57 km) and Malaya Pera (88 km) to the right and Ora (55 km) to the left.[3]