Japan is an island nation in eastern Asia with an area of 377,887 square kilometers (145,902 square miles) and comprised of over 6,800 islands including, Honshu, Hokkaido, Kyushu, Shikoku, and Okinawa. There are 47 administrative divisions referred to as prefectures.
The total population exceeds 126.7 million people with over 90% living in urban areas. As of 2015, 36.3% of the total population resided in Tokyo Metropolis, Kanagawa Prefecture, Osaka Prefecture, Aichi Prefecture and Saitama Prefecture. Among these, the largest proportion was in Tokyo, with 10.6% of the total population.1
Population ageing coupled with a low birth rate are two major concerns facing Japan and Japan’s health care system.