The Alfenz is approximately 26 kilometres (16 mi) long and the main river in the valley Klostertal.

The Alfenz flows into the Ill 3.5 km (2.2 mi) east of Bludenz.

The S16 expressway (Arlberg Schnellstraße) runs alongside the river.

The Alfenz belongs to the Rhine basin, while across the Arlberg to the east the water flows into the Danube.

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