Salzburg is on the banks of the River Salzach, at the northern boundary of the Alps.

The Salzach is a river in Austria and Germany. It is a right tributary of the Inn and is 227 km (141 mi) in length, its flow 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 (5,643 km2 (2,179 sq mi)) lies in Austria, the remainder in Germany (Bavaria). Its largest tributaries are the Lammer, Berchtesgadener Ache, Saalach, Sur and Götzinger Achen.

From the junction with its Saalach tributary in the northern Salzburg basin, the Salzach forms the border between Bavaria, Germany and the Austrian states of Salzburg and Upper Austria for almost 70 km (43 mi). Cities on the banks in this lower section include Laufen and its sister town Oberndorf bei Salzburg, Tittmoning, and Burghausen. All these towns have border crossings. The river finally joins the River Inn in Haiming between Burghausen and Braunau.

The Salzach is often incorrectly referred to as "Salzburg River" by international visitors. This is probably due to the similarity in the names.

More Info: en.wikipedia.org