Usui Pass
Mountain pass in Japan / From Wikipedia, the free encyclopedia
36.3446°N 138.6507°E / 36.3446; 138.6507
The Usui pass (碓氷峠, / Usui-tōge) is a mountain pass that lies between Nagano and Gunma prefecture in Japan. It has served as one of the major transportation routes in central Japan since at least the eighth century.