noun
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.
From 日本 (Nihon, 'Japan') + アルプス (Arupusu, 'Alps'), coined in the late 19th century by Westerners who likened the mountains to the European Alps.