Eysturoy is separated by a narrow sound from the main island of Streymoy. Eysturoy is extremely rugged, with some 66 separate mountain peaks, including Slættaratindur, the highest peak in the archipelago at 2,890 feet (880 metres). The country's two longest fjords, Skálafjørður and Funningsfjørður, almost split the island in two halves. The isthmus in between, Millum Fjarða, is one of the flattest areas in the country. Important settlements on Eysturoy are Fuglafjørður in the north and the densely populated area of the municipalities of Runavík and Nes in the south.