Flexen Pass (el. 1773 m.) is a high mountain pass in the Austrian Alps in the Bundesland of Vorarlberg.It connects the upper Lech River valley between Warth Lech and Zurs with the Klostertal near Stuben.The pass road was built in 1940 and leads to the road over the Arlberg pass. It became a necessity when the Arlberg railroad was opened in 1884. Before that traffic mostly went over the Tannberg by way of Oberstdorf.The first stretch of road was opened in October 1897 up to the pass. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Natural Place