The Bolshaya Pera (, also ÃÂþûÃÂÃÂðàÃÂÃÂÃÂð Bolshaya Pyora) is a river in Amur Oblast, Russia. It is a right tributary of the Zeya. It begins on the AmurâÂÂZeya 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 long, and has a drainage basin of . Its main tributaries are Dzhatva (57 km) and Malaya Pera (88 km) to the right and Ora (55 km) to the left.