The Saastal or the Saas Valley is an Swiss Alps 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.
The region hosts an extensive winter sports region, comprising the separate ski areas of Saas-Fee, Saas-Grund and Saas-Almagell. As well as individual ski passes a combined pass is available; each of these areas is connected to the other parts of the region by postal bus, rather than dedicated skilifts.
On 30 August 1965 an approximately 2 million-cubic metre ice avalanche broke from the Allalin Glacier and engulfed the Mattmark dam construction site at the head of the Saastal, killing 88 workers. The accident, the worst alpine construction disaster in Swiss history, delayed completion of the hydro-electric project and led to tighter national safety standards for working beneath hanging glaciers.
The Saastal's landscape is dominated by almost twenty glaciers, but they are shrinking rapidly. Glacier Monitoring Switzerland (GLAMOS) reported that the country lost about 10 % of its total ice volume during the hot summers of 2022 and 2023 alone, the steepest two-year decline on record. Southern Valais glaciers, including the Fee and Allalin ice bodies above Saas-Fee, recorded some of the greatest thickness losses, and several small cirque glaciers vanished entirely.
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