The Gantrisch Regional Nature Park is one of 17 parks of national importance in Switzerland. Of its 20 park municipalities, 19 are in the canton of Bern and one in the canton of Fribourg. The Gantrisch Nature Park covers an area of 414 km² at an altitude of between 510 m (Bern-Belp Airport) and 2239 m (Schafberg) and includes the Schwarzsee tourist region.

The Gantrisch Nature Park lies between the three Swiss cities of Bern, Thun and Fribourg and is crossed by the Gürbe, Schwarzwasser and Sense rivers. The park area includes the Längenberg, a lateral moraine of the Aare glacier, as well as the Belpberg, which is also partly made up of moraine material from the Aare glacier. In the south, the Gantrisch Nature Park is bordered by the Gantrisch chain, which gives the nature park its name and contains the headwaters of the Gürbe. In the southwest of the nature park is the Schwarzsee lake and the primeval landscape of Brecca.

20 municipalities make up the Gantrisch Nature Park (as of 2020): Belp, Burgistein, Forst-Längenbühl, Gerzensee, Guggisberg, Gurzelen, Kaufdorf, Kirchdorf, Niedermuhlern, Oberbalm, Plaffeien, Riggisberg, Rüeggisberg, Rümligen, Rüschegg, Schwarzenburg, Thurnen, Toffen, Wald, Wattenwil.