Jachthaven De Zwemmer is a small marina tucked into the residential neighborhood of Zuiderburen in Leeuwarden, situated on the Nauwe Greuns, a minor waterway that connects to the Van Harinxmakanaal.

The harbor offers around 25 permanent berths, with a maximum draft of 1. 50 meters.

Facilities include showers, toilets, shore power, and water hookups, housed in an ecologically designed floating harbor building that uses solar energy and its own water-treatment systems.

The marina's location makes it a convenient base for exploring a broad range of Frisian waters.

Destinations such as Grouw, Eernewoude, Oude Vennen, De Leijen, Bergumermeer, and Pikmeer are all reachable within roughly an hour, and the staande mastroute (fixed-mast route) provides straightforward access toward Eernewoude and Grouw.