Actually, the popularity is based on the Nature which defines the Nerwey like fjords. And narrow valleys. Have you heard about Sognefjord which is the longest one over 200 kilometers into the land which is too high as compared to others. If you want to read in detail regarding Beauty of Nerwey. Visit Nerwey.org. https://adfty.biz/travel/what-is-nerwey-deeply-explained/