Simplon Pass (2,005 m or 6,578 ft) is a high mountain pass between the Pennine Alps and the Lepontine Alps in Switzerland. It connects Brig in the canton of Valais with Domodossola in Piedmont (Italy). The pass itself and the villages on each side of it, such as Gondo, are in Switzerland. The Simplon Tunnel was built beneath the vicinity of the pass in the early 20th century to carry rail traffic between the two countries. About 500 metres west of Simplon Pass lies a lower, unnamed pass, at an altitude of 1,994 m or 6,542 ft. It is the lowest point on the watershed between the basins of the Rhone and the Po in Switzerland. Rotelsee is a lake located near the pass at an elevation of 2028 m.