Quite possibly the most famous of Japan’s cycling courses the Shimanami Kaido is a stretch of islands linked by bridges that spans the Seto Naikai, or inland sea of southern Japan. ituated between the main island of Honshu and the southern island of Shikoku, the Shimanami Kaido boasts views of turquoise seas, small fishing towns, endless islands of citrus, and the longest suspension bridge in Japan.