Issie

Lake Ikeda in Kagoshima Prefecture at the southern tip of Kyushu, Japan, is a volcanic caldera lake of considerable depth and unusual thermal properties. It is also the home of a lake monster tradition that emerged in the late 20th century and became, briefly, one of Japan's most discussed cryptid cases. The creature is known as Issie, a name that blends the lake's name with the international suffix for lake monsters following the global fame of Loch Ness.

The legend's modern origin is traced to September 1978, when more than 20 people reportedly observed a large, dark creature surface near the lake's edge. Witnesses described an animal over 30 feet in length with multiple humps visible above the waterline, moving at speed before submerging. The collective nature of the sighting — multiple independent witnesses seeing the same thing simultaneously — lent it unusual credibility. It was reported widely in the Japanese press and attracted television coverage.

A follow-up sighting of note came in December 1978, when a local resident named Yutaka Kawaji captured photographs of what he described as two large humps moving through the water. The photographs show dark shapes at the surface consistent with a large animal but without identifiable anatomical features. They remain the primary photographic evidence associated with Issie. Additional sightings followed through the 1980s, enough that Lake Ikeda erected a statue of the creature on its shoreline and established an Issie exhibit at the local visitor center.

Lake Ikeda is home to large populations of Japanese eels (Anguilla japonica), which can reach lengths of four feet, and is particularly noted for its giant specimens. Very large eels moving in groups at the surface could account for the multiple-hump sightings. The lake's volcanic character means it is also subject to occasional gas releases that could disturb the surface in unusual ways, and its depth of over 230 meters means comprehensive surveying has never been completed. The Kagoshima government and local businesses have been supportive of the Issie tradition, recognizing its tourism value. Local fishermen's cooperatives have participated in organized sonar searches without conclusive results. Issie has become an important part of local identity in Kagoshima Prefecture, her image appearing on sweets, pottery, and festival materials throughout the region. The Japanese tradition of creating regional cryptid mascots has given Issie a cultural longevity that transcends the biological question entirely: even if the lake were definitively shown to contain nothing unusual, the creature's place in Kagoshima's public identity would be unlikely to diminish, as lake monster legends in Japan have proved remarkably resilient to skeptical investigation.