Котлин
Construction of a complex of dams protecting St. Petersburg from the floods began in 1979 but was halted in the 1990s when 60% was completed. The construction was resumed in 2005 and the completed dam was inaugurated on 12 August 2011. The dam is also the last completed part of the Saint Petersburg Ring Road, providing direct roadway access from mainland to the Kotlin Island and Kronshtadt.