| Alp | |
| Progression: | Sihl→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Switzerland |
| Subdivision Type2: | Canton |
| Length: | 19.3km (12miles) |
| Source1 Elevation: | 1500m (4,900feet) |
| Mouth Elevation: | 783m (2,569feet) |
The Alp is a river in the Swiss canton of Schwyz and a tributary of the Sihl. It has a length of 19.3km (12miles). The river rises on the northwestern flanks of the Brünnelistock and the northern flanks of the Kleiner and Grosser Mythen mountains near Brunni, and flows in generally northerly direction through the village of Alpthal, the village of Trachslau, the town of Einsiedeln and the village of Biberbrugg. At Biberbrugg, the river Biber joins the Alp. Some 2km (01miles) north of Biberbrugg, at Dreiwässern the Alp flows into the Sihl.[1]
The valley between Brunni and Einsiedeln is called Alptal.