The Chūbu region(中部地方, Chūbu-chihō), Central region, or Central Japan(中部日本)
is a region in the middle of Honshū, Japan's main island.
The pilot shaft of the Seikan
Tunnel, the world's longest sub-aqueous tunnel(53.85 km) between the Japanese islands of Honshū and Hokkaidō,
The Chūbu region covers a large and
geographically diverse area of Honshū which leads to it generally being divided into three distinct subregions:
Tōkai, Kōshin'etsu, and Hokuriku.