High Quality Content by WIKIPEDIA articles! The Saint Petersburg Flood Prevention Facility Complex (Russian: Комплекс защитных сооружений Санкт-Петербурга от наводнений, tr. kompleks zashchitnykh sooruzheniy Sankt-Peterburga ot navodneniy), unofficially the Saint Petersburg Dam, is a 25 km (16 mi) complex of dams for flood control near Saint Petersburg, Russia. The dam extends from Lomonosov northward to Kotlin Island (and the city of Kronstadt), then turns east toward Cape Lisiy Nos near Sestroretsk.