The Kronverk, is a ground fortification for the Sts. Peter and Paul Fortress in Saint Petersburg, in which country?
Peter and Paul Fortress The Peter and Paul Fortress is the original citadel of St. Petersburg, Russia, founded by Peter the Great in 1703 and built to Domenico Trezzini's designs from 1706 to 1740. In the early 1920s, it was still used as a prison and execution ground by the Bolshevik government.
Karpovka River The Karpovka (Russian: Ка́рповка ) is a small river of the Neva basin in Saint Petersburg, Russia. It separates Aptekarsky Island (right bank) from Petrogradsky Island (left bank). The Karpovka flows from the Bolshaya Nevka to the Malaya Nevka and is 3 km long. The Russian name is derived from the old Finnish name of the river, "Korpijoki". The Saint Petersburg Botanical Garden and Ioannovsky Convent are situated on the right bank of the river.