The largest island of the Amakusa group is Shimoshima, which is 26.5 miles long and 13.5 miles in extreme width (42.6 km × 21.7 km). It is situated at 32°20'N, 130°E, separated from the rest of Kumamoto Prefecture by the Yatsushiro Sea.
It has no high mountains, but its surface is very hilly. Four of the peaks rise to a height of over 1,500 feet (460 m). The population resorts to the terrace system of cultivation to cope with the lack of flat arable land.
Amakusa, along with the neighboring Shimabara Peninsula, became the site of the Shimabara rebellion in the 17th century, led by Christians. Following the rebellion, Kakure Kirishitan, the Christians who had survived, continued to practice their faith in secret, despite massive persecution.
Amakusa produces a little coal and pottery stone, both being used by the potters of Hirado and Satsuma Province. Many kilns remain on the islands today, and pottery and pottery stone are still exported.
Amakusa pottery has been recognised by the government. The retail company Muji brought out its own line of Hakuji home ware, which is produced out of ground translucent Amakusa stones kneaded into clay, using traditional techniques.
There are also ferries between the islands and the neighboring prefectures of Kagoshima Prefecture and Nagasaki Prefecture. The ferry from Oniike on the north Shimoshima to Kuchinotsu, at the southern tip of the Shimabara Peninsula, is run by the Shimabara Railway and operates hourly each day. The ferry boat from Tomioka Port in Reihoku, sailing north to Mogi in Nagasaki Prefecture, is operated by Yasuda Sangyo Kisen Co. Ltd. Two ferries from Shinwa and Ushibuka, in the south of Shimoshima, connect Amakusa to Nagashima in Kagoshima Prefecture.
- 'Clay Mineral Associations And Mineralogical Properties Of Quartz In Some Pottery Stones Of Western Kyushu, Japan. M.Nakagawa. Applied Clay Science, Vol. 8, Issue 5. Jan. 1994
- MUJI IT Department. "MUJI Online - Welcome to the MUJI Online Store". Muji.eu. Retrieved 2016-09-11.
- (Japanese) Sea-Gull Ferry information, web: Shima.
- (Japanese) Ferry boat schedule, web: Yasuda-kisen.