外がい帯たい

noun

convex side of a mountain arc; outer zone of an arc-shaped archipelago

Geological term referring to the outer, convex side of a curved mountain belt or island arc. Often contrasted with 内帯 (inner zone).

See also: 内帯

• 日本にほん列れっ島とうの外がい帯たいは太たい平へい洋よう側がわに位い置ちする。

  The outer zone of the Japanese archipelago is located on the Pacific side.

noun

southwestern Japan south of the Median Tectonic Line

Specifically refers to the region of southwestern Japan (southwest of the Itoigawa-Shizuoka Tectonic Line) that lies on the Pacific Ocean side of the Median Tectonic Line. This is a major geological division of Japan.

See also: 西南日本外帯

• 西せい南なん日本にほん外がい帯たいには四し国こく山さん地ちや紀き伊い山さん地ちが含ふくまれる。

  The outer zone of southwestern Japan includes the Shikoku Mountains and the Kii Mountains.