Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bothnia to the west and the Gulf of Finland to the south, opposite Estonia. Its capital and largest city is Helsinki. Finland has a population of 5.6 million. The official languages are Finnish and Swedish, the mother tongues of 84.1 percent and 5.1 percent of the population, respectively. Finland's climate varies from humid continental in the south to boreal in the north. Its land is predominantly covered by boreal forest, with over 180,000 recorded lakes. Finland was first settled around 9000 BC after the last Ice Age. During the Stone Age, various cultures emerged, distinguished by different styles of ceramics. The Bronze Age and Iron Ages were marked by contacts with other cultures in Fennoscandia and the Baltic region.