WSV Sluis 1, also known as Jachthaven Oosterhout, is a marina situated on the western edge of Oosterhout at the junction of the Wilhelminakanaal and the Markkanaal in Noord-Brabant.

The harbour lies in a wooded setting and is well sheltered and monitored by camera surveillance. Visiting boaters should note a fixed bridge at the entrance with a clearance of approximately 4. 10 to 4. 60 metres depending on water levels.

The marina accommodates both permanent berth holders and visitors, with guest berths available. The town centre of Oosterhout, with shops and restaurants, is roughly a 10–15 minute walk away.