Osaka (大阪, Ōsaka^?)  listen (help·info) is a city in the Kansai region of Japan's main island of Honshu, a designated city under the Local Autonomy Law, the capital city of Osaka Prefecture and also the biggest part of Keihanshin area, which is represented by three major cities of Japan, Kyoto, Osaka and Kobe. Located at the mouth of the Yodo River on Osaka Bay, Osaka is the third largest city by population after Tokyo (special wards) and Yokohama.

Keihanshin is the second largest area in Japan by population and one of the largest metropolitan areas highly ranked in the world, with nearly 18 million people, and by GDP the second largest area in Japan and the seventh largest area in the world.