Troms in northern Norway is located north of the Arctic Circle. The western border is the very rugged and indented coastline facing the Norwegian Sea and the eastern is Sweden. There are mountains in all parts of Troms with fjords intruding deep into the land and even separating the land into islands. The Lyngen Alps (Lyngsalpene) are the most alpine. The capital is Tromsø, which was the starting point for numerous North Pole expeditions with its Arctic seaport.
The mountains consist mostly of metamorphic rocks and are insoluble. But there are areas of marble with numerus caves, for example in Salangen and Skånland. There is no mining and actually nothing we could list so far. The most spectacular subterranea are some road tunnels, financed with North Sea oil, which cross fjords underground and connect islands.