In English, the region is also known as Trentino-South Tyrol or by its Italian name Trentino-Alto Adige. The region has a population of about 1,017,000 people (519,000 in Trentino and 498,000 in South Tyrol). The population density in the region is low compared to Italy as a whole. In 2008, it equaled to 74.7 inhabitants per km2, whereas the average figure for Italy was 198.8. The population density in Trentino was 83.6, slightly higher than the one registered in South Tyrol that was equal to 67.3. As of 2008, the Italian national institute of statistics ISTAT estimated that 70,834 foreign-born immigrants lived in the region altogether, equal to 6.9% of the total regional population.
The main language groups are Italian (about 63% of the total) and German (33%), with a small minority speaking Ladin (4%). The region is bordered by Tyrol (Austria) to the north, by Graubünden (Switzerland) to the north-west and by the Italian regions of Lombardy and Veneto to the west and south, respectively. It covers 13,607 km² (5,253 sq mi). It is extremely mountainous, covering a large part of the Dolomites and the southern Alps.