Yumenoshima (夢の島, literally "Dream Island") is a district in Kōtō, Tokyo, Japan, consisting of an artificial island built using waste landfill.
Construction started in the late 1950s as a potential solution to the garbage problem in the city of Tokyo.
Today, Yumenoshima has been covered over with a layer of top soil and includes a sports park (with baseball and soccer fields and a gymnasium), the Yumenoshima Tropical Greenhouse Dome, the Fukuryu Maru Memorial Museum, a large-scale yacht marina, waste disposal and incinerating facilities.
At one time the island was even the home of the Daigo Fukuryū Maru, a fishing boat which had been exposed to nuclear fallout during the Bikini Atoll test. The boat was sold to a scrap dealer in the 1960s (the levels of radiation had dropped to safe levels in the mid 1950s), and abandoned there.