The central mass of the mountain is enclosed between two glaciers, of which the most considerable is the Biferten Glacier. This originates in a vast snow-basin south-east of the Tödi, bounded to the south by the peaks of Stoc Grond, Piz Urlaun and Bifertenstock, forming the boundary of the two cantons. The last-named peak is connected with the Selbsanft by a massive wall of precipitous rocks enclosing the glacier on the east side, and forcing it, after descending at first nearly due east, to bend round first to north-east, and then due north. On the opposite side a ridge of rocks called Bifertengrätli, descending north-east from the Tödi, forms the boundary of the Biferten Glacier. The end of this nearest the Tödi is the Grünhorn, whereon stood the first hut of the Swiss Alpine Club. The Biferten Glacier is difficult to access, owing to its steepness. It includes some ice-falls, with intermediate steeps, and is much crevassed. On the west side of the Tödi lies the Sand Glacier or Sandfirn, which descends towards the Sand Alp from the dividing ridge forming the pass to the south. This does not extend so far south as the head of the Biferten Glacier. The ridge running due north from the Stoc Grond to the summit of the Tödi overlooks the head of the Val Russein on the Graubünden side of the chain, but it appears that the main mass of the Tödi lies altogether on the north side of the watershed.