The district is located in the northern foothills of the Alps. The main rivers of the district are the Lech and the Ammer. The Ammersee and the Starnberger See are at the northern boundary of the district.
The coat of arms combines the symbols of the two precursor districts. The lion in top as the symbol of the Hohenstaufen dynasty was taken from the coat of arms of the district Weilheim. The crosier and the mining tools in the bottom are derived from the coat of arms of the district Schongau, symbolizing both the important monasteries as well as the coal mining in the district.