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The Wigger (formerly also called Wiggeren) is a river in the Swiss cantons of Lucerne and Aargau. It is an important tributary of the river Aare. The Wigger is around 41 kilometers long and flows from south to north for most of its length. The largest city in the Wigger valley is Zofingen.The river rises from the north slope of the Napf in the canton of Lucerne near the border to the canton of Berne in a height of about 1300 meters.

The Aarewaage (in local Swiss German dialect: Woog) is a whirlpool phenomenon in the Swiss river Aare at Aarburg, canton of Aargau. In 1996, it was added to the Federal Inventory of Landscapes and Natural Monuments.At the location of the Aarewaage, the river widens into a broader natural basin and at the same time meets a rock on which Aarburg Castle is located.