This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Floods in SaintPetersburg. en Scheme of floods in SainPetersburg from Brockhaus and Efron Encyclopedic Dictionary ru Brockhaus and Efron Encyclopedic Dictionary Brockhaus and Efron Encyclopedic Dictionary PDBrockhaus Efron thcentury maps of Saint Petersburg Floods in Saint Petersburg Maps from Brockhaus and Efron