The village of Alpthal is located in the upper reaches of the Alptal, the valley of the river Alp upstream from Einsiedeln. Also within the municipality of Alpthal are the popular ski resort of Brunni, higher up the valley, and the settlement of Eigen, down the valley. To the north and beyond Eigen, the Alp flows through the village Trachslau and further through the town of Einsiedeln some beyond. To the west, south and east the municipality is surrounded by the peaks of the Nüsellstock, Näbikenfirst, Grossbrechenstock, Kleiner Mythen, Grosser Mythen, Rotenfluh, Furggelenstock and Gschwändstock. The Haggenegg, between the Kleiner Mythen and the Grossbrechenstock, and the Holzegg, between the Grosser Mythen and Rotenfluh, both cross towards Schwyz. Both Mythen and Hagenegg belong however to the municipality of Schwyz.