Cromstrijen
Cromstrijen was a municipality on the Hoeksche Waard Island in the western Netherlands, in the province of South Holland. The municipality covers an area of of which is water. It was formed on 1 January 1984, when the municipalities on the Hoeksche Waard were merged into larger municipalities. On 1 January 2019 it was merged with the municipalities of Binnenmaas, Korendijk, Oud-Beijerland, and Strijen to form the municipality of Hoeksche [Waard (municipality)|Hoeksche Waard].
The municipality of Cromstrijen consists of the communities Klaaswaal and Numansdorp.
Its population was in.