The Shimanami Kaido is the toll road that connects Honshu to Shikoku. It is 60 kilometer long and passes over six small islands in the Seto Inland Sea. It is also called the Nishiseto Expressway.

The Shimanami Kaido begins on Honshu in Onomichi. It then leads across the six islands of Mukaishima, Innoshima, Ikuchijima, Omishima, Hakatajima and Oshima, before terminating on Shikoku in Imabari. The route was opened in 1999; the bicycle route is easy to ride, well marked and maintained, and diverges from the expressway on the islands. Don’t worry about getting lost; simply follow the blue line on the road. Along the bridges there is a designated cycling path separated from the road which helps to make your bike trip more comfortable and enjoyable. The calm sea, wonderfully scenic islands and magnificent bridges attract visitors from all over the world.