IKI, an island belonging to Japan, lying off the north-western coast of Kyushu, in 45' N. lat. and 129° 4o' E. long. It has a circumference of 86 m., an area of 51 sq.m., and a population of c. 50,000. The island is, for the most part, a tableland about 50o ft. above sea-level. The anchorage is at Gonoura, on the south-west. A part of Kublai Khan's Mongols landed at Iki when about to invade Japan in the 13th century, for it lies in the direct route from Korea to Japan via Tsashima.