The Tsjûkemar (also written Tjeukemeer in Dutch) is the largest inland lake in Friesland, located in the southwestern part of the province near the village of Oldeouwer. It sits at the boundary between the Frisian Lakes region and the De Weerribben-Wieden National Park in the neighboring province of Overijssel, giving it a position of some geographical significance within the broader Dutch waterway network.

The lake is part of a system of 24 official Frisian Lakes that make up the Waterland van Friesland region. A popular boating circuit, the Tsjûkemar Loop, covers just over 55 kilometers and passes not only the Tsjûkemar itself but also the Langweerder Wielen and the Goaiingarypster Puollen. At an average speed of 6 km/h, the full loop takes approximately nine hours, though the route is well suited to a multi-day trip. The surrounding area is described as spacious and open, with small villages along the way as well as Heerenveen, Friesland's largest village.

Paddlers should be aware that the Tsjûkemar accommodates fast motorboat traffic within a designated zone marked by yellow buoys. Outside that zone, all watercraft are expected to adjust their speed to other water users. This motorboat activity is a meaningful consideration for paddlers, as the lake is not exclusively a quiet-water environment.

The lake contains at least two islands — the Tsjûkepolle and the Marchjepolle — which are connected to a local legend about two sisters named Tsjûke and Marchje. A statue of Tsjûke and March stands near the Echten pumping station on the lake's edge, where a text explains the folklore surrounding the lake's origin and name.

A charter and rental base, Turfskip Yacht Charter, operates out of Echtenerbrug on the Tsjûkemar, making it a practical starting point for those without their own craft. The route includes both fixed high bridges and bridges that open on schedule; paddlers planning trips should check current clearance heights and bridge opening times in advance. Sustainable practices are encouraged on the water, including the use of blue diesel or electric motors and proper waste management.