Shikoku (四国, literally " four provinces ")is one of the five main islands of Japan. Shikoku is the second smallest main island after Okinawa. It is 225 km or 139.8 mi long and between 50 and 150 km or 31.1 and 93.2 mi wide. It has a population of 3.8 million (as of 2015, 3.1%). It is located south of Honshu and north east of Kyushu. The Shikoku Pilgrimage (四国遍路, Shikoku Henro ) or Shikoku Junrei (四国巡礼) is a multi-site pilgrimage of 88 temples associated with the Buddhist mo