the Japanese Alps
Refers to the mountain ranges in central Honshu, often divided into the Northern, Central, and Southern Alps.
夏に日本アルプスを縦走する計画を立てている。
I'm planning a traverse of the Japanese Alps this summer.
日本アルプス was named after the European Alps; the English name Japanese Alps is generally credited to the British mining engineer William Gowland in the late nineteenth century.