The height of the Alps and their surface area relative to the territory of Austria make a large part of the country uninhabitable.

An excerpt from the article 31 facts about Austria

Inhabited areas, agricultural and communication areas cover approximately 40% (35.000 square kilometers) of the country's area. Most of the population is located in the Danube Valley and in the lowlands and highlands north, east, and south of the Alps - about 2/3 of Austria's population lives there.