Kalach Urban Settlement, an administrative division and a municipal formation which the town of Kalach and seven rural localities in Kalachevsky District of Voronezh Oblast, Russia are incorporated as
Kalachevskoye Urban Settlement, a municipal formation which the town of district significance of Kalach-na-Donu in Kalachyovsky District of Volgograd Oblast, Russia is incorporated as
The 1745 atlas published by the Russian Academy of Sciences has the boundary follow the Don beyond Kalach as far as Serafimovich before cutting north towards Arkhangelsk, while other 18th- to 19th-century mapmakers such as John Cary followed Strahlenberg's prescription.