Gaasterlân-Sleat is a former municipality in the northern Netherlands. Its official name is in West Frisian, the Dutch name being Gaasterland-Sloten. In 2014 it merged with the municipalities of Lemsterland and Skarsterlân to form the new municipality De Fryske Marren.

Skarsterlân is a former municipality in the province of Friesland in the Netherlands. The municipality was created 1 January 1984 by merging the municipalities of Doniawerstal and Haskerland, the part of Utingeradeel consisting of the villages Akmarijp and Terkaple and the village Nieuwebrug that used to belong to Heerenveen. City hall was located in Joure. On 1 January 2014 it merged with the municipalities of Lemsterland and Gaasterlân-Sleat to form the new municipality De Fryske Marren.