Walden is a neighbourhood in the southern part of the Vöhren district in Amt Aldáer. It has been owned by the Walda family for decades, with Sjoerd Walda as the current Landlord/Baron. The main house on the land is the farm Grennsted, where the Walda family resides. Scattered around the area are small farms, mostly owned by cottagers or used by Grennsted labourers.   A large part of the neighbourhood is covered by Grenn forest, an ancient forest with a high ecological value that is protected by the Walda family. Additionally, sections of the rivers Kild and Holle are also protected due to their contribution to the biodiversity of the neighbourhood and district. In addition to the main farm Grennsted, there is a watermill called "The Black Poplar" located on the banks of the river Holle. The mill is used not only by residents of the Walden estate but also by people from other areas. Currently, the watermill is used as a flour mill, oil press, and sawmill.