Watersportvereniging Flacquee is a recreational sailing and boating club based in the historic harbor of Middelharnis, situated on the Binnenhaven with a direct connection to the Haringvliet.

The club offers berths for members as well as access for visiting boaters, who are directed to the municipal harbormasters for berthing arrangements and harbor fees.

The club's clubhouse is located at Vingerling 15 and serves as a social hub for members and visitors alike. A "Jollenveld" storage area for trailerable boats is available near the boat ramp at Havenhoofd.

Visiting boaters are welcome to stop in at the clubhouse on Friday evenings.