Issie (イッシー Isshī) is a legendary Japanese lake monster; said to lurk in Lake Ikeda, on Kyushu Island. It is described as being saurian in appearance. The name is formed in analogy with "Nessie" (the Loch Ness Monster).
The creature was reportedly photographed in 1978, by a man who went by the name "Mr. Matsubara". Twenty other people reportedly also saw the creature in 1978, which they described as black and about 5 Meters (16.4 feet) long, swimming in the lake water. In 1991, another visitor to the lake caught video footage supposedly of a bizarre-looking creature estimated to be 30 meters (98.4 feet) in length.