noun
southwest Japan
Geographic term for the region southwest of the Itoigawa-Shizuoka Tectonic Line, often contrasted with 東北日本 (northeast Japan).
See also: 東北日本
西南日本は地質学的に東北日本と区別される。
Southwest Japan is geologically distinguished from Northeast Japan.
Refers to the northeast part of Japan, on the opposite side of the Itoigawa-Shizuoka Tectonic Line.
Compound of 西南 (southwest) and 日本 (Japan).