Sweden also has plenty of long rivers draining the lakes. Northern and Central Sweden have several wide rivers known as ''älvar'', commonly sourced within the Scandinavian Mountains. The longest river is Klarälven-Göta älv, which originates in Trøndelag in central Norway, running 720 miles before it enters the sea at Gothenburg. Dalälven and the Torne are the second and third longest rivers in the country. Torne marks a large part of the Finland border. In southern Sweden, narrower rivers known as ''åar'' are also common. The vast majority of municipal seats are set either on the sea, a river or a lake and the majority of the country's population live in coastal municipalities.