The Bavarian Prealps (German: Bayerische Voralpen) are a mountain range within the Northern Limestone Alps in south Germany. They include the Bavarian Prealp region between the river Loisach to the west and the river Inn to the east; the range is about 80 kilometres (50 mi) long and 20–30 kilometres (12–19 mi) wide. The term is not defined politically, but alpine-geographically because small areas of the Bavarian Prealps lie in Tyrol (e.g. the Hinteres Sonnwendjoch south of the Rotwand).