For the next 130 kilometers below the Tsimlyansk Dam, the sufficient water depth in the Don River is maintained by the sequence of three dam-and-ship-lock complexes: the Nikolayevsky Ship Lock (Николаевский гидроузел), Konstantinovsk Ship Lock (Константиновский гидроузел), and the best known of the three, the Kochetovsky Ship Lock (Кочетовский гидроузел).