Jachthaven Wassenaar is the marina of Watersportvereniging Wassenaar, situated on the Zijlwatering at Van Duivenvoordelaan 562. This "new" inner harbour offers around 200 berths and connects to the Oude Rijn, which flows toward Katwijk and Leiden.

Visiting boaters with a air draft below 2. 50 metres are welcome to use a free berth as transient guests. The harbour is one of two operated by the association; the other is an older facility near Oostdorperweg/Hofcampweg dating from 1893.

The Zijlwatering site is secured by fencing and camera surveillance, with a coded gate for access on foot or by bike.

Drinking water is available at the docks, and the clubhouse provides toilets, showers, a laundry room, a chemical-toilet emptying point, and a sewage station.