The Belomor-Baltic Channel was constructed in 1931–1933; its total length is 227 km, of which 48 were created artificially. The system includes 19 floodgates, 15 dams, 51 dikes, 12 dam outlets, and other hydrotechnical facilities. The channel connects Lake Onega and the White Sea.It goes through three regions of Karelia, and the final floodgates of Belomor-Baltic channel are in the Belomorsk region. The channel was constructed by thousands of prisoners in a network of forced labour camps. In Belomorsk, there is a memorial to the victims, builders of the channel.