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View from the cycling lane of a Shimanami Kaido bridge over the Seto Inland Sea, islands in the distance

Shimanami Kaido: Island Hopping Across the Seto Inland Sea

The Shimanami Kaido connects Onomichi on Honshu with Imabari on Shikoku, threading across six islands in the Seto Inland Sea via a chain of bridges. It’s about 70 km point to point, but the appeal isn’t distance — it’s that the entire route has a dedicated, well-marked cycling path running alongside the car lanes, including on the bridges themselves.

Compared to most of the routes on this site, this one is short and infrastructure is excellent. It’s a good example of what a route looks like when a country actually builds for cyclists rather than tolerating them.

The Route

Vollbildanzeige

Starting from Onomichi, the path is marked with a blue line painted directly on the road — at every junction you simply follow the blue line, no navigation app required.

The bridges are the highlight: each one has a separate cycling lane, physically separated from traffic. Ramps are consistently built to keep the gradient gentle rather than steep — though at most bridges there’s also a steeper shortcut ramp if you don’t mind the extra effort.

Dedicated cycling path with blue line marking on a Shimanami Kaido bridge ramp
The blue line marks the route across every bridge — no navigation needed
Steep stairs shortcut next to the curved bike ramp on the Shimanami Kaido, blue line marking the cyclist route
A stairs shortcut next to the ramp — steeper, but faster

Between bridges, the route passes through small island communities, citrus groves, and coastal roads with little traffic. The main line across the islands is just the shortest path from bridge to bridge — if you want to see more, each island also has its own loop road, so the route can easily be extended by circling one or several islands instead of cutting straight across.

Cycling path curving toward the suspension towers of a Shimanami Kaido bridge over the Seto Inland Sea
Approaching one of the Shimanami Kaido bridges

Practical Notes

  • No tolls: unlike car traffic, cyclists don’t pay anything to cross the bridges.
  • Rental option: even if you’re traveling through Japan without your own bike, renting one just for this route is well worth considering — rental shops in Onomichi allow one-way drop-off in Imabari (or vice versa).
  • Time needed: a fit rider can comfortably do the round trip — Onomichi to Imabari and back — in a single day. Two days allows time to actually stop on the islands, or take the loop roads mentioned above.
  • Heat: in summer it can get quite hot, worth planning water stops and timing accordingly.

Is it Worth a Detour?

Given the short distance and the quality of the infrastructure, this is an easy add-on if you’re already touring in Japan, rather than a reason on its own to fly in.

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