Tokyo is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area in the world. It I the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family.
Tokyo is often thought of as a city, but is commonly referred to as a metropolitan prefecture. The prefecture is part of the world's most populous metropolitan area with upwards of 35 million people and the world's largest urban agglomeration economy!
Also, despite the fact of being on an island, Tokyo has millions of inhabitants. In fact, Canada has a fewer people than the Tokyo metropolitan area. Try to catch up Canada! You have a lot of beautiful lands that could eventually become as great as Tokyo!