Boei 12 is a marina and pavilion situated on the southern shore of Schildmeer, a 284-hectare lake in the province of Groningen. The marina serves both permanent berth holders and transient visitors, and is well suited to sailing and windsurfing.

Seasonal berths run from 1 April to 31 October, and winter storage afloat is also available.

Alongside the marina, a waterfront pavilion offers food and drink, making Boei 12 a natural stopping point for boaters as well as walkers and cyclists exploring the roughly 14-kilometre path that circles the lake.

Schildmeer forms part of the broader Roegwold nature reserve, with most of its shoreline protected as a nature area.