The Burgumer Mar (Dutch: Bergumermeer) is a lake near the town of Burgum in the Dutch province of Friesland. The lake was formed during the last ice age. It is a popular water sports area with multiple yacht harbours. The splits the lake into a northern and southern part. Since March 15, 2007, the West Frisian name Burgumer Mar is the official name; before that date the Dutch name was the official one). The villages Jistrum, Eastermar and Sumar together with Burgum border the lake.