Prins Willem-Alexanderhaven is a marina located in Yerseke, Zeeland, on the Oosterschelde. The harbor offers berths for approximately 190 yachts and serves as one of Yerseke's main marinas.

Visiting sailors should contact the port master via Marifoon channel 74 or by phone before mooring.

If the port master is unavailable, boaters may moor at Beatrixhaven, the transient jetty, or at the end jetties of Jetty K or L, but should not occupy a reserved box without permission.