Osaka is located on the western part of the main island of Honshu on Osaka Bay. Following Tokyo and Yokohama, Osaka is Japan's third largest city. 2.6 million people live here. With 17.5 million residents, the metropolis of Osaka, located in the urban region of Kansai, is one of the largest metropolis regions in the world. The city is Japan's traditional trading centre. In addition, it is one of the country's most important industrial centres and has one of its most significant harbours. According to the Forbes list of the most expensive cities to live in, Osaka is the second most expensive city in the world, following Tokyo. Osaka is also known as "Japan's Kitchen".