The Principality of Liechtenstein is a doubly landlocked alpine country in Central Europe, bordered by Switzerland to the west and south and by Austria to the east. Its area is just over 160 square kilometres, and it has an estimated population of 35,000. Its capital is Vaduz. The biggest town is Schaan. Liechtenstein has the second highest gross domestic product per person in the world and also has the second lowest unemployment rate in the world at 1.5% (Monaco is first). Liechtenstein is the smallest yet the richest German-speaking country in the world and the only country to lie entirely within the Alps. It is the only predominantly German-speaking country not to share a common border with Germany and the only predominantly German-speaking nation to have a monarch. Liechtenstein is situated in the Upper Rhine valley of the European Alps and is bordered to the east by Austria and to the south and west by Switzerland. The entire western border of Liechtenstein is formed by the Rhine. Measured south to north the country is about 24 km. Despite its Alpine location, prevailing southerly winds make the climate of Liechtenstein comparatively mild. In winter, the mountain slopes are well suited to winter sports.