Kalsoy is an island located in the north-east of the Faroe Islands between Eysturoy and Kunoy. Due to the island's thin shape and road-tunnels it is known as 'the flute.' There are four settlements on Kalsoy, all located on the east coast (the west coast is steep cliff): Húsar, Mikladalun , Syðradalur and Trøllanes . The towns are connected to each other via tunnels, some of which are up to 2 km long. There is a lighthouse at Kollor, the northern-tip of Kalsoy. The island also has two mountains: Nestindar (787 m) and Botnstindur (743 m).