Tokyo is the capital and most populous city of Japan. Located at the head of Tokyo Bay, the prefecture forms part of the Kantō region on the central seaside of Honshu, Japan’s largest island. Tokyo operates as Japan’s economic center and is the seat of the Japanese government and the Emperor of Japan. It is the most populous city in the world, with an assessed 37.5 million residents as of 2018; the city proper has a population of 14 million people.