Shikoku

is the smallest (225km long and between 50km and 150km wide) and least populous (4,141,955 as of 2005) of the four main islands of Japan, located south of Honshū and east of Kyūshū island. Its ancient names include Iyo-no-futana-shima , Iyo-shima , and Futana-shima . The current name refers to the four former provinces which made up the island: Awa, Tosa, Sanuki, and Iyo.
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Noun
1. the smallest of the four main islands of Japan; south of Honshu and east of Kyushu; separated from Honshu by the Inland Sea; forested and mountainous
(hypernym) island
(part-holonym) Japan, Japanese Islands, Japanese Archipelago