The Japanese Prefecture is a term used to describe the administrative divisions of Japan. Aichi is a prefecture located in the Chubu region of Japan, with a population of over 7 million people. Okinawa is an island prefecture located in the Ryukyu Islands in the south of Japan, with a population of 1.5 million people. Mie is a prefecture located in the Kansai region of Japan, with a population of over 1.8 million people. Ehime is a prefecture located in the Shikoku region of Japan, with a population of over 1.4 million people.