Tokyo is one of three large cities. The largest of the islands of Japan. The central part of the city was once marsh and lagoons that were filled in when Ieyasu took over. This area is called shitamachi, or "low city," site of the original Edo. The terrain becomes increasingly hilly to the west of the city's center until it becomes the Musashino Plateau, where Yoyogi Park, the Meiji Shrine, Roppongi, and fashionable Harajuku are located. Other notable places on the west side are the nightclub district of Roppongi and the high-fashion districts of Aoyama and Harajuku.