Six Islands of the Shimanami Kaido — A Complete Guide to Mukojima, Innoshima, Ikuchijima, Omishima, Hakatajima, and Oshima

What is the Shimanami Kaido? | Japan’s Premier Island-Hopping Route by Bridge

The Shimanami Kaido is one of the three major routes connecting Honshu and Shikoku—and the only one that can be crossed by bicycle or on foot.

Along this route, a series of islands are connected by bridges. Among them, six islands in particular stand out for their strong sense of local life and distinct regional character:

  • Mukaishima (Onomichi City, Hiroshima)
  • Innoshima (Onomichi City, Hiroshima)
  • Ikuchijima (Onomichi City, Hiroshima)
  • Omishima (Imabari City, Ehime)
  • Hakatajima (Imabari City, Ehime)
  • Oshima (Imabari City, Ehime)

While these islands are physically connected, each offers a completely different atmosphere and identity.

In this column, we take a closer look at the unique characteristics of each island.

Overview & Characteristics of Each Island

Mukaishima | A residential island seamlessly connected to Onomichi

Area: Approx. 22.22 km²
Population: Approx. 20,994 (as of 2020)

Mukaishima sits directly across the Onomichi Channel from central Onomichi City, just a few minutes away by ferry. Its defining feature is this remarkable proximity.

Rather than being a tourist destination, Mukaishima functions primarily as a residential and port town, with well-developed infrastructure including supermarkets, schools, and hospitals.

In the southeastern part of the island, traditional fishing village scenery, narrow alleyways, and coastal views create a nostalgic atmosphere. It is perhaps the island where the idea of “actually living on an island” feels most tangible.

Please click here for more information about Mukaishima.

Innoshima Island | A Historic Island in the Heart of the Shimanami Kaido

Area: Approx. 35 km²
Population: Approx. 20,944 (as of 2020)

Innoshima is known as a base of the Murakami Kaizoku (Murakami Pirates), who once controlled the Seto Inland Sea during the medieval period. Traces of this history can still be found throughout the island.

With a background in shipbuilding and maritime industries, the island also features port facilities and industrial zones. At the same time, it is recognized as the birthplace of the hassaku citrus, reflecting a strong agricultural culture.

Innoshima offers a balanced mix of tourism, industry, and everyday life.

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Ikuchijima Island｜An Island Shaped by the Scenery of the Seto Inland Sea and Citrus Farming

Area: Approx. 31.2 km²
Population: Approx. 8,000–9,000

Ikuchijima is one of the most tourism-oriented islands along the Shimanami Kaido.

Centered around the Setoda area, the island brings together:

  • One of Japan’s leading lemon-producing regions
  • Museums, temples, and art installations
  • Beautiful beaches and coastal scenery

These elements combine to create an island that is enjoyable simply to walk around.

Unique landmarks such as Kosanji Temple and the Hill of Hope offer distinctive scenery not found on other islands. Beyond tourism, Ikuchijima also presents strong potential for business ventures such as cafes and accommodation.

Please click here for more information about Ikuchijima.

Omishima Island | Where Mythology and Nature Coexist

Area: Approx. 64.5 km²
Population: Approx. 6,000

Omishima is the largest island in the Shimanami Kaido area and is known as a “sacred island,” home to Oyamazumi Shrine—the head shrine of all Yama Shrine branches across Japan.

The island features a landscape of mountains, sea, and farmland, with quiet villages scattered throughout.

In recent years, the number of newcomers and cyclist-oriented accommodations has increased, making it well-suited for those seeking a lifestyle that combines work with living in nature.

Please click here for more information about Omishima.

Hakatajima | An Island Where the Sea and Daily Life Are Closely Connected

Area: Approx. 20.9 km²
Population: Approx. 6,000

Hakatajima is widely known for “Hakata Salt,” reflecting its history in salt production.

Though relatively small in size, the island offers a compact mix of attractions, including:

  • Beaches
  • Roadside stations
  • Marine leisure activities (such as dolphin experiences)
  • Natural phenomena like sandbars appearing at low tide

Its scale and accessibility make it especially suitable for families and short stays.

With a close relationship between tourism and everyday life, Hakatajima is often seen as a “just-right” island.

Please click here for more information about Hakatajima.

Oshima | An Island Connecting Shimanami Kaido and Imabari

Area: Approx. 41.9 km²
Population: Approx. 6,000

Oshima lies at the Shikoku-side entrance of the Shimanami Kaido and is known for its dramatic scenery, including views of the Kurushima Kaikyo Bridge.

The panoramic view from Kirosan Observatory Park is considered one of the most iconic landscapes along the route.

The island’s terrain is relatively mountainous, with settlements spread along the coastline. It offers an appealing balance for those seeking both open views and a quieter living environment.

Please click here for more information about Oshima.

Shared Appeal of the Shimanami Islands

Across all six islands, several common characteristics stand out:

  • The calm natural environment of the Seto Inland Sea
  • Close-knit local communities
  • A large number of vacant houses and traditional homes
  • Opportunities not just for tourism, but for living and starting a business

These islands are not simply tourist destinations. When viewed from the perspective of living, working, or launching a business, they reveal a depth and richness that goes far beyond surface impressions.

Conclusion | Understanding the Islands Means Rethinking How You Live

Each of the six islands along the Shimanami Kaido may appear similar at first glance, but in reality, each has a distinctly different identity.

  • Islands close to urban centers
  • Islands with strong tourism appeal
  • Islands rich in nature and spiritual heritage
  • Islands suited for quiet living

Getting to know these islands is, in many ways, a process of discovering the kind of lifestyle that suits you best.

At Retro Fudosan (Real Estate), we go beyond location and property details. We focus on the atmosphere, rhythm of life, and character of each place to help you find a property that truly fits your vision.

If any island has caught your interest, we encourage you to explore it in depth.

Purchasing real estate or relocating is a significant milestone for many people. We hope to support you in making a thoughtful and confident decision—one that you will not regret.