Binnenmaas was a municipality in the western Netherlands, in the province of South Holland. The municipality had a population of data missing in 2021, and covers an area of 75.57 km2 (29.18 sq mi) of which 6.31 km2 (2.44 sq mi) is water. It is named after the lake of the same name.

Maasdam is a village in the Dutch province of South Holland. It is located about 14 km south of the city of Rotterdam, in the municipality of Hoeksche Waard, on the rural Hoeksche Waard island. From the 14th Century until around 1800, Maasdam was also the name of the local administrative area, the fief and later the "ambacht".