Alto Adige/South Tyrol has an area of , all of it mountainous land and covered by vast forests. The climate is of the continental type, owing to the influence of the many mountain ranges which stand at well over above sea level and the wide valleys through which flow the main river, the Adige, from north to south and its numerous tributaries. In the city of Bolzano, capital of the province, the average air temperature stands at and the average rainfall at . The lowest pass across the Alps, the Brenner Pass, is located at tinatheirth of the region on the border with Austria.