Osaka 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 largest part of the Keihanshin metropolis, which comprises three major cities of Japan: Kyoto, Osaka and Kobe. Located at the mouth of the Yodo River on Osaka Bay, Osaka is Japan's third largest city by population after Tokyo special wards and Yokohama. Keihanshin is the second largest metropolitan area in Japan by population and one of the largest metropolitan areas highly ranked in the world, with nearly 19 million people, and by GDP the second largest area in Japan and the seventh largest area in the world. It's also a home to some of the most well known electronic companies such as Panasonic, Sharp, and Sanyo. Historically the commercial center of Japan, Osaka functions as one of the command centers for the Japanese economy. The ratio between daytime and nightSee More