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For the SI unit of electric current, see Ampere.
Amper I.jpg
The river Amper south of Fürstenfeldbruck
Origin Northern Limestone Alps
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 countries Germany
Location Bavaria, Germany
Length 185 km
Avg. discharge ±45 m³/s
Basin area 3,100 km²

The Amper (known in its upper reaches as the Ammer) is a river in southern Bavaria, Germany – the largest tributary of the Isar river. The Amper flows in a generally north-eastwards direction, reaching the Isar in Moosburg, 185 kilometres (115 mi) from its source in the Ammergau Alps, with a flow of 45 m³/s. It runs through the Ammersee; upstream of the Ammersee it is known as the Ammer. Its major tributaries are the Glonn (located near Augsburg), the Würm (the outflow of Lake Starnberg), and the Maisach.

The Ammer/Amper system within the Isar basin

The Ammer flows through Oberammergau. Cities along the Amper include Fürstenfeldbruck, Dachau and Moosburg.