Prins Willem-Alexanderhaven is a marina located in Yerseke, a historically significant harbour town in Zeeland, situated on the Oosterschelde — a tidal estuary with strong currents and changing water levels.

The harbour is named after King Willem-Alexander of the Netherlands and plays an important role in the local shellfish industry for which Yerseke is well known. The marina offers berths for approximately 190 yachts.

Visiting sailors should contact the harbour master before mooring, reachable via VHF Marifoon channel 74. If the harbour master is unavailable, visitors may moor at the Beatrixhaven transient jetty or at the end jetties of Jetty K or L.

Mooring in a designated box without prior permission is not permitted.