Well - Iana

Japanese: 井坑 - いあな

...The Saikai National Park contains Wajima and Tarojima in Tomie Bay, as well as Kanjiga Castle in Yamazaki, which is believed to have been the base of the Japanese pirates. There are lava tunnels called Iana in various places on the plateau. [Kyoichi Akaike]...

From Fukue Island

...The crater floor of Mount Mitake (144m) is used as a junior high school playground. The Tomie Peninsula in the south is a basalt lava plateau with an average elevation of 20m, and lava tunnels called 'iana' can be seen here and there. Tamanoura Bay in the southwest is a typical submerged coastline with many good harbors. Tamanoura Port once flourished as a base for bottom trawl fishing boats, but there is no trace of that now.

*Some of the terminology that refers to "well pit" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…西海国立公園に含まれる富江湾の和島，太郎島や，倭寇の根拠地であったと推定される山崎の勘次ヶ城がある。台地の各所には井坑（いあな）と呼ばれる溶岩トンネルがみられる。【赤池享一】。…

【福江島】より

…また箕（み）岳(144m)の火口底は中学校の運動場に利用されている。南部の富江半島は標高平均20mの玄武岩の溶岩台地で，ところどころに井坑（いあな）と称する溶岩トンネルがみられる。南西部の玉之浦湾は典型的な沈水海岸で，良港が多く，玉之浦港は底引網漁船の基地として栄えたが，今はそのおもかげはない。…

※「井坑」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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