mountain group of the Rhaetian Alps, straddling eastern Switzerland (Graubünden canton), western Austria (Vorarlberg), and southern Liechtenstein. It divides the valleys of Montafon (northeast) and Prätigau (southwest). The group's highest peak is Schesaplana (9,724 feet 【2,964 m】) on the Austrian-Swiss border, east-northeast of Maienfeld, Switz. Tourism is the main economic base of the region.