Jan de Groot Watersportcentrum is a marina and watersports centre located along an old arm of the Maas, near the Noord-Brabant village of Lithoijen, at approximately river kilometre 200.

The facility offers more than 250 berths for vessels between 4 and 20 metres, all equipped with water and 16-ampere electrical connections. Visiting boaters are welcome.

The centre provides a broad range of services, including a boat lift rated to 30 tonnes, indoor and outdoor storage, a painting hall, a rentable workshop, a sailmaker, and repair services for inboard and outboard engines.

A bar-bistro with a large terrace, a showroom, and a boat shop are also on site. Its position just above the Lith lock makes it a practical base for day trips to nearby waterways including the Maas, Waal, De Lithse Ham, and Gouden Ham.