Zwartsluisje is a hamlet in the Dutch province of South Holland. It is a part of the municipality of Hoeksche Waard and lies about south of Spijkenisse. Zwartsluisje is not a statistical entity, and considered part of Zuid-Beijerland and Piershil. It has place name signs, and consists of about 115 houses. References Populated places in South Holland Hoeksche Waard