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Amper I.jpg
The river Amper south of Fürstenfeldbruck
Country Germany
Location Bavaria, Germany
Basin features
Main source Northern Limestone Alps
River mouth Isar
48°30′1″N 11°57′24″E / 48.50028°N 11.95667°E / 48.50028; 11.95667Coordinates: 48°30′1″N 11°57′24″E / 48.50028°N 11.95667°E / 48.50028; 11.95667
Basin size 3,100 km2 (1,200 sq mi)
Physical characteristics
Length 185 km (115 mi)
  • Average rate:
    ±45 m3/s (1,600 cu ft/s)

The Amper River, called the Ammer River upstream of Lake Ammer, through which it runs, is the largest tributary of the Isar River in southern Bavaria, Germany. The Ammer and Amper flow in a generally north-eastward direction, reaching the Isar (as the “Amper”) in Moosburg, 185 kilometres (115 mi) from the Ammer’s source in the Ammergau Alps, with a flow of 45 m³/s. Major tributaries are: the Glonn, near Augsburg; the Würm, which is the outflow of Lake Starnberg; and the Maisach.

The Ammer/Amper system within the Isar basin

The Ammer starts just south of the Passion village of Oberammergau, or Upper Ammer Vale. Cities along the Amper include Fürstenfeldbruck, Dachau and Moosburg.