Yokohama's population of 3.7 million makes it Japan's largest incorporated city. Yokohama had been the world's largest suburb until the formation of New Taipei (excluding Mainland China as cities there are nonstandard).
Yokohama developed rapidly as Japan's prominent port city following the end of Japan's relative isolation in the mid-19th century, and is today one of its major ports along with Kobe, Osaka, Nagoya, Hakata, Tokyo, and Chiba.
Minato Mirai 21(みなとみらい21,Minato Mirai Nijūichi?), often shortened to Minato Mirai or MM, is a large urban development, and the central business district of Yokohama, Japan. Initially developed in the 1980's, Minato Mirai 21 was designed as a new urban center planned to connect Yokohama's traditionally important areas of Kannai and the Yokohama Station area.