The Saastal or the Saas Valley is an alpine valley in the district of Visp, in the eastern part of the Canton of Valais , Switzerland . It is the valley of the river Saaser Vispa. It is separated from the Mattertal to the west by the Mischabel massif. Villages in the valley are, upstream, Eisten , Saas-Balen , Saas-Grund , Saas-Fee and Saas-Almagell . Until 1893, the municipalities of Almagell, Balen, Fee and Grund were a single parish, with the only church in Grund. Mattmarksee is a reservoir built in the 1960s.