Sweden, officially the Kingdom of Sweden, is a Nordic country in Northern Europe. It borders Norway to the west and north, Finland to the east, and is connected to Denmark in the southwest by a bridge-tunnel across the Öresund Strait. At 450,295 square kilometres (173,860 sq mi), Sweden is the largest country in Northern Europe, the third-largest country in the European Union and the fifth largest country in Europe by area. The capital city is Stockholm. Sweden has a total population of 10.3 million of which 2.6 million have a foreign background. Persons with foreign backgrounds are defined as persons who are foreign born, or born in Sweden with foreign born parents. It has a low population density of 22 inhabitants per square kilometre (57/sq mi) and the highest urban concentration is in the central and southern half of the country.