Tourists visit the Osaka Castle, a landmark of Osaka, Japan, June 25, 2019. The 14th Group of 20 (G20) summit will take place on June 28-29 in Osaka. The city of Osaka is located by the Osaka Bay in the southwest of Honshu, the main island of Japan. As the capital city of Osaka Prefecture, it is an industrial and commercial center as well as a major transportation hub in the Kansai region. With a population of 2.72 million and an area of 225 square kilometers, Osaka makes up one of Japan's largest metropolitan areas together with the neighbouring cities including Kyoto and Kobe. (Xinhua/Wang Jingqiang)