Geijsman is a marina and watersports facility on the Brielse Meer, situated in a distinctive position between the dunes and the port area of Rotterdam, near Oostvoorne in South Holland.

The site serves as an access point to the Brielse Meer, a long narrow lake at the heart of a 750-hectare recreation area offering boating, small beaches with designated swimming zones, and cycling paths along the shore.

The marina offers berths ranging from dinghy docks to larger outside docks, along with toilet and shower facilities, laundry machines, a sewage pump-out station, and ample hardstanding for winter storage.

A boat hoist with a 25-tonne capacity and a well-stocked watersports shop are also on site. Motorhome pitches are available for visitors arriving by land.