The Vorarlberg Rhine Valley (German: Vorarlberger Rheintal), also called the Vorarlberg Oberland and Unterland, is a section of the Alpine Rhine Valley and is divided into the Upper and Lower Rhine Valley (oberes and unteres Rheintal) based on the direction of flow of the river.
The Unterland runs from the shore of Lake Constance to the Kummenberg, the Upper Rhine valley lies south of the Kummenberg.
In this region, which includes the urban areas of Bregenz and Dornbirn, live about 180,000 people, around half the population of Vorarlberg.
Geographically the Lower Rhine Valley also includes the municipality of Altach.
Due to its historical links with the municipality of Götzis and membership of the district of Feldkirch, Altach is often considered part of the Oberland.