Stichting Recreatiehaven Onderdendam is a small marina and campsite situated on the Warffumermaar at the edge of the picturesque village of Onderdendam, in the province of Groningen.

The facility offers berths for visiting and permanent boat owners, alongside camping pitches, camper van spaces, and seasonal fixed pitches. Transient boaters are welcome for short or extended stays.

The marina includes a trailer ramp with a maximum draft of 1. 50 m, shore power, a fresh water tap, toilets, showers, and a wastewater disposal point.

The village centre is approximately 250 metres away, and the surrounding area features designated cycling and walking routes.