Boats connect settlements along the fjord and its sidearms. Larger villages on the fjord and its branches include Leirvik, Ytre Oppedal, Vadheim, Høyanger, Vikøyri, Balestrand, Hermansverk, Sogndalsfjøra, Gudvangen, Flåm, Aurlandsvangen, Lærdalsøyri, Årdalstangen, Gaupne, and Solvorn. Gudvangen is situated by the Nærøyfjord, a branch of the Sognefjord particularly noted for its unspoiled nature and dramatic scenery, and only 300m across at its narrowest point. The Nærøyfjord is a UNESCO World Heritage Site. From the village of Flåm, the Flåm Railway climbs 864m up to Myrdal Station in a distance of only 20kmthe steepest unassisted railway climb in the world. Around the inner end of the fjord, three of Norway's famous stave churches have survived: Kaupanger and Urnes (along the shoreline) and Borgund (30km into the Lærdal valley). The Sognefjord Span (power lines) crosses the fjord with a span of 4597m. This is the second largest span of power lines in the world. The fjord has become a tourist attraction with summer tourists being an important part of the local economy.