1. Usui Pass
Wikipedia definition
2. Usui PassThe Usui Pass is a mountain pass that lies between Nagano and Gunma Prefectures in Japan. It has served as one of the major transportation routes in central Japan since at least the eighth century.
Read “Usui Pass” on English Wikipedia
Read “碓氷峠” on Japanese Wikipedia
Read “Usui Pass” on DBpedia


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