The Hegemer Mar, also known as the Heegermeer, is a scenic lake located in the Friesland province of the Netherlands, southwest of the village of Heeg. This beautiful lake is part of a larger interconnected water system, flowing directly into the Fluessen, which is the second-largest lake in Friesland. The lake itself was formed by glacial activity during the Saalien glacial period, creating an elongated glacial valley it shares with the Fluessen and the Morra. A notable feature is the concrete shipping route that runs through the lake, which forms part of the Johan Friso Canal. Several islands dot the lake, with Rakkenpolle being the largest. The area is popular for various water sports and offers a relaxing environment for a day out on the water.