It borders Bavaria (Germany) in the north, the districts Imst and Landeck in the south, and Bregenz and Bludenz (both in Vorarlberg) in the west.

The district is 1,236.37 km2 (477.37 square miles), with a population of 31,758 (January 1, 2012), and population density of 26 inhabitants per square kilometre (67/sq mi).

The district comprises the valleys of the Lech, the Tannheimer Tal, and the so-called Zwischentoren between Reutte and Fern Pass.

Mountain ranges in the district include parts of the Lechtal Alps, Wetterstein Mountains, Allgäu Alps and Tannheim Mountains.

Prominent lakes include Plansee, Heiterwanger See, Haldensee, and Vilsalpsee.