Isabellagriend is a nature reserve on the Oolderplas southwest of Roermond, near the village of Herten. Nudist recreation which is marked with signposts is permitted on Haaksstaartenplas and on the north bank of the Prinsenstaartenplas.

Naturists have been coming to the nature reserve since 1994. Due to the vastness of the area, it is possible to meander naked through the groves and meadows for about 2 kilometers.

The area is owned by the Limburg Landscape and is designed as a nature reserve with space for recreation. Grazing Galloway cattle share the area, so be careful not to disturb or feed the animals. There are badgers and other mainly nocturnal animals. Igniting a fire is forbidden.