The Salzach is a river in Austria and Germany. It is 227 kilometres (141 mi) in length and is a right tributary of the Inn, which eventually joins the Danube. Its drainage basin of 6,829 km2 (2,637 sq mi) comprises large parts of the Northern Limestone and Central Eastern Alps. 83% of its drainage basin lies in Austria, the remainder in Germany (Bavaria). Its largest tributaries are Lammer, Berchtesgadener Ache, Saalach, Sur and Götzinger Achen.

The Inn is a river in Switzerland, Austria and Germany. The 518 km (322 mi) long river is a right tributary of the Danube, being the third largest tributary of the Danube by discharge. The highest point of its drainage basin is the summit of Piz Bernina at 4,049 m (13,284 ft). The Engadine, the valley of the En, is the only Swiss valley whose waters end up in the Black Sea.