A volcanic island, Iceland is Europe's westernmost country and home to the world's northernmost capital city, Reykjavík. Although glaciers cover more than a tenth of the island, the Gulf Stream and warm southwesterly winds moderate the climate—most residents occupy the country's southwest. Established in 930, the national assembly, or Althingi, is the world's oldest continuous parliament. Under the Danish crown for more than 500 years, the country became a republic in 1944. Almost all of Iceland's electricity and heating come from hydroelectric power and geothermal water reserves. Explosive geysers, relaxing geothermal spas, glacier-fed waterfalls like Gullfoss (Golden Falls), and whale watching attract more than 270,000 visitors a year.