Japan is a mountainous country with little arable land. It has over 140 million people living on its four main islands - Hokkaido, Honshu, Shikoku, and Kyushu. The islands experience different climates and seasons throughout the year. To make use of the limited space, Japan utilizes terrace farming of rice, fish farming at sea, and densely populated cities with innovative architecture that maximizes space like the Nakagin Capsule Tower in Tokyo.