is a City in Japan , located at the mouth of the Yodo River on Osaka Bay , in the Kansai Region of the main island of Honshū .
The city is the capital of Osaka Prefecture . Often dubbed the Second City of Japan, Osaka was historically the commercial capital of Japan, and to date the heart of Japan's second largest, and the world's ninth largest metropolitan area of Osaka-Kobe-Kyoto , whose population is 19,220,000.
A unique title that the city of Osaka holds is the first place in Japan for day to night
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