many artificial islands were built as naval fortifications in the meiji and taishō periods. after world war ii these islands were converted to residential or recreational use. odaiba, also known as "daiba", was one of six artificial islands constructed in 1853 as a fortification to protect the tokugawa shogunate at edo, and was known as the shinagawa daiba. after world war ii odaiba was incorporated into tokyo and redeveloped for commercial and recreational use. after world war ii yumenoshima was planned as a solution to dispose of the large quantities of garbage from the tokyo metropolitan area. the island was constructed between 1957 and 1967 and hosts numerous recreational facilities. hakkei island (), formerly landfill number 14, was constructed in 1985 and is home to yokohama hakkeijima sea paradise. other artificial islands include heiwa, katsushima, shōwa, keihin, and higashiōgi islands.