Haven Marenland Winsum is a marina and water-sports access point situated directly on the Winsumerdiep, on the western side of the provincial road bridge near Camping Marenland.

The harbour offers around 50 berths for both visitors and seasonal users, and serves as a practical launch point for exploring the Winsumerdiep, which connects to the Reitdiep and the Lauwersmeer National Park.

The site supports a range of water activities including boat rental, canoeing, kayaking, and paddleboarding. The centre of Winsum lies roughly 500 metres away, making this a convenient base for those arriving by water.