Shimanami Kaido: Japan’s Great Bike Route, Island by Island

There’s a specific moment on the Shimanami Kaido — usually somewhere around the third bridge, legs finally settling into rhythm, the Seto Inland Sea spread out flat and silver on both sides — where it becomes obvious why this is the ride people fly to Japan for. Seventy-odd kilometers, six islands, and a chain of bridges engineered specifically to be crossed on two wheels: nothing else in Japan’s cycling scene looks quite like it, and nothing else has built the same reputation. It’s a route detailed in full in our feature Shimanami Kaido — An Island Hopping Journey, and this guide expands on the practical side: how the route works, what to expect island by island, and how to actually plan the trip.

What the Shimanami Kaido Actually Is

The Shimanami Kaido is a roughly 70-kilometer expressway connecting Onomichi, on Honshu’s Seto Inland Sea coast, to Imabari, on the island of Shikoku, via a chain of six smaller islands linked by a series of dramatic bridges. What sets it apart from every other long bridge crossing in Japan is that it was built with cyclists and pedestrians in mind from the outset — a dedicated, well-marked blue line runs the entire route, separate from vehicle traffic on most of the crossing, making it one of the only ways in the world to cycle continuously between two major islands on purpose-built infrastructure rather than a shoulder lane.

The Route, Island by Island

Starting from Onomichi, a working port town with a laid-back, artsy character worth a night on its own, the route crosses onto Mukaishima, the first and smallest link in the chain, before continuing to Innoshima, known locally for its citrus groves and a small castle worth a detour. Ikuchijima follows, home to the striking Kosanji Temple complex and some of the route’s best rest-stop food. Omishima comes next, with the Oyamazumi Shrine drawing a steady trickle of history-minded riders off their bikes for a break. Hakatajima is smaller and quieter, mostly a connector island, before the final stretch onto Oshima, from which the last and longest bridge — the Kurushima-Kaikyo Bridge, one of the longest suspension bridge systems in the world — carries riders into Imabari on Shikoku. Most riders cover the full route in a single long day; a two-day pace with an overnight partway along lets you actually stop and enjoy each island rather than just passing through.

When to Cycle the Shimanami Kaido

Spring (April-May) and autumn (October-November) are the clear best windows — mild temperatures, manageable humidity, and, in spring, the added bonus of the Inland Sea’s citrus blossoms. Summer is rideable but hot and humid, particularly across the exposed bridge sections with no shade; an early start is essential if you’re riding in July or August. Winter is quieter and still very doable, with cooler but generally mild temperatures for this latitude, and it’s the best season if an empty route matters more to you than warm weather.

Planning Your Ride: The Practical Side

Onomichi and Imabari both have well-established bike rental operations, including one-way rental schemes that let you pick up in one city and drop off in the other, removing the need to backtrack. Rentals range from basic city bikes to genuine road bikes for riders who want to push the pace, and e-bikes are increasingly available for those more interested in the islands than the workout. The route itself is close to unmissable thanks to the painted blue line, though a physical or downloaded map is still worth having for detours to specific sights on each island. For riders who’d rather not fly with their own bike, this ease of rental is one of the Shimanami Kaido’s biggest practical advantages over more remote Japanese cycling routes.

Beyond the Bridge: Extending the Trip

Riders with extra time often extend into Shikoku’s interior once they reach Imabari — Kochi Prefecture, further south, holds some of the region’s best riding and is covered in Japan Eco Track: Kochi Kōyō Cycling and Take a Trip to the Wild Side: From Kansai to Kochi. On the Honshu side, Onomichi sits within reasonable striking distance of Hiroshima, making a Hiroshima–Shimanami Kaido–Shikoku itinerary a natural way to build a longer trip around the ride.

Frequently Asked Questions

Further reading: see our original feature, Shimanami Kaido — An Island Hopping Journey, and browse the full Cycling in Japan archive for more routes across the country.