Reschen Pass is a mountain pass across the main chain of the Alps, connecting the Upper Inn Valley in the northwest with the Vinschgau region in the southeast. Since 1919, the border between South Tyrol, Italy and Tyrol, Austria has approximately followed the watershed, the pass summit at a height of 1,504 metres (4,934 ft) being completely on Italian territory.

The main chain of the Alps, also called the Alpine divide is the central line of mountains that forms the drainage divide of the range. Main chains of mountain ranges are traditionally designated in this way, and generally include the highest peaks of a range. The Alps are something of an unusual case in that several significant groups of mountains are separated from the main chain by sizable distances. Among these groups are the Dauphine Alps, the Eastern and Western Graians, the entire Bernese Alps, the Tödi, Albula and Silvretta groups, the Ortler and Adamello ranges, and the Dolomites of South Tyrol, as well as the lower Alps of Vorarlberg, Bavaria, and Salzburg.