Discover a hidden island across the sea: ride over the Ku Island Bridge and begin an unhurried, eco-friendly escape on Shikoku and the Uwa Sea
Under the southwest sun of Shikoku, the last white fishing boat eased away from the pier, its wake trailing lightly through the towering bridge arch, and the whole bay fell so quiet only the sea breeze whispered. Hop on a bike and pedal up the graceful steel box-girder ramp to the Ku Island Bridge; the emerald sea slides away on either side beneath your wheels. At the crest, the blue-and-white sign for Hon Ku Island comes into view — the long-awaited Ku Island circuit ride officially begins
🗺️ a one-of-a-kind cycling paradise: why is Ku Island essentially only for two-wheelers?
At the approach to Hon Ku Island's connecting bridge, the most striking features are two large signboards (fig. 7):
"Cars cannot circle the island (automobiles cannot use the coastal prefectural road)": because the southwest coast of Ku Island is steep, broken by cliffs, and the roads are extremely narrow, many sections are only about 1m wide. Apart from two-wheeled bicycles and pedestrians, ordinary four-wheeled motor vehicles simply cannot get through the southern impassable sections.
A chosen cycling sanctuary: it is precisely these harsh terrain limits that cut off the noise of outside traffic, turning the roughly 10 km island loop into a low-density, all-natural seaside greenway that cyclists across Japan dream of
📸 the photos: sea, sky, bridge, and Ku Island landmarks
The dramatic depth of sea, sky, and bridge (figs. 1–4): from the high approach you can look down on the Ku Island Bridge like a dragon skimming the water, the tall central arch leaving a wide navigation channel; a working fishing boat parts the jade waves, tracing dynamic ripples on the tranquil, jelly-like sea, with Ku Island's verdant peaks rising in the background—utterly poetic
A panoramic view of Ku Island (figs. 5–6): on the wide water brushed by a light breeze, Ku Island lies like a green whale in the Uwa Sea, with the simple outlines of Hon Ku Island's village houses and dark-tiled roofs visible at the mountain foot
Key signs and destinations (fig. 8): after crossing the bridge, a brown wooden waymarker by the sea clearly points the way:
Kujira Taishi (Kujira Taishi, 800m): a cliffside sacred site housing a statue of the monk Kōbō Daishi (Kūkai); legend says a spirit whale once came ashore to protect islanders, making this a core place for maritime safety and prayers on the island
Udo Cape (Udo Cape, 2.6km): the westernmost headland of Ku Island facing the majestic Bungo Channel, an excellent viewpoint for Shikoku sunsets and dramatic cliffs
Kushima Community Center (Kushima Community Center, 1.5km): the island's administrative and cultural gathering place, and a key resupply and meetup point on the circuit
🌊 the Uwa Sea's supreme scenery: how does it rank on Shikoku?
When people think of Shikoku travel, they often think of the Seto Inland Sea art festivals or the Shimanto River in Kochi, but those who know the off‑beat spots put the Uwa Sea high on their list of hidden gems:
Shikoku's last stretch of pristine "jelly sea": unlike the relatively calm, enclosed feel of the Seto Inland Sea, the Uwa Sea opens directly onto the Bungo Channel swept by the Kuroshio Current. The water is crystal clear, and nearshore seas show deep emerald and sapphire tones, with some of Shikoku's best water transparency
The three-dimensional wonder of ria coast fjords: the sea cuts deeply into the rolling mountains, where neat, stone-built vertical terraces line the slopes. Hills and sea sit extremely close. The surface is dotted with colorful sea bream farming cages and pearl oyster buoys, and the fishing ports, terraced fields, and azure sea weave a production-focused fishing village tableau unique in Japan
An off-the-beaten-path, pristine slow-travel landmark: the Uwa Sea retains quiet fishing villages and sincere local warmth dating from the Meiji to Showa eras. There are no large tourist crowds and no heavy commercial development, making it the ultimate healing puzzle piece for travelers who want deep, freeform exploration and serious cycling
💡 Ku Island cycling tips:
Best to ride clockwise: start after you get off the Ku Island Bridge and head toward the Hon Ku Island Community Center (turn right, clockwise). The first half is relatively flat and close to fishing villages, while the second half gradually climbs coastal hills on the way to Udo Cape
Travel light and take it slow: turns on the island's mountain roads may have fallen leaves and loose stones, so slow down on descents. Bring a camera or telephoto lens — every stop offers a soothing expanse of vivid blue