About This Proposal
When people hear the name “Seto Inland Sea,” many may first imagine calm waters and scenic islands.
It is widely known as a picturesque tourist destination filled with historic port towns, and is beloved for its beautiful island-dotted landscapes.
However, the Seto Inland Sea was not merely a beautiful inland sea.
During the early modern period, it developed into a maritime transportation network that supported the Japanese archipelago, allowing numerous port towns and commercial cities to flourish. In the modern era, the Seto Inland Sea further evolved into an international sea route connected to the wider world. Behind this transformation lay a long history of maritime faith centered on prayers for safe voyages.
This proposal explores the history of the Seto Inland Sea that sustained Japan through its port towns, shipping routes, and maritime beliefs from the early modern to modern period.
Explanation of Value
1. The Maritime Network That Supported Early Modern Japan
The Seto Inland Sea has long functioned as a vital maritime route connecting eastern and western Japan. Its calm waters and numerous islands fostered a unique seafaring culture in which sailors navigated by carefully reading the tides and winds. During the early modern period, a nationwide logistics network emerged, bringing prosperity to many port towns.
Waiting for the tides, reading the winds
This was the sailing culture of the Seto Inland Sea
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Compared to the open ocean, the Seto Inland Sea is relatively calm, and from ancient times through the early modern period it served as the great maritime artery of western Japan.
Yet despite its calm waters, sailors had to navigate complex tidal currents and seasonal winds, leading to the development of “tide-waiting” and “wind-waiting” port towns throughout the region.
In places such as Tomonoura, Murotsu, and Mitarai, unique port town cultures emerged where sailors stopped to exchange goods and information.
Commercial cities such as Onomichi, Kurashiki, and Yanai also developed as major hubs supporting nationwide distribution networks through maritime and river transportation.
On the islands, maritime lifestyles supported by shipbuilders and shipping merchants also flourished. In the Shiwaku Islands, advanced navigation and shipbuilding techniques have been passed down through generations.
These port towns and islands were not merely logistics centers, but places where people built distinctive landscapes and ways of life in harmony with the sea.
The historic townscapes and cultural landscapes scattered around the Seto Inland Sea continue to preserve the memory of the vast maritime network that sustained the logistics, economy, and cultural exchange of early modern Japan.
2. Maritime Faith Praying for Safe Voyages
In the Seto Inland Sea, many people relied on the blessings of the sea, while continuing voyages alongside dangerous tides and storms. Through this experience, unique maritime beliefs centered on prayers for safe navigation spread throughout the region.
Offering prayers to the sea
This was the relationship between the Japanese people and the sea
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In the Seto Inland Sea, where maritime transportation flourished, sailors constantly faced the dangers of the sea.
As a result, maritime faiths praying for safe voyages and abundant catches developed throughout the region.
Japanese maritime belief does not revolve around a single supreme deity. Different sea deities were worshipped in different regions, and people offered prayers to the seas and routes connected to their own lives.
Sumiyoshi Taisha in Osaka was long worshipped as a guardian deity of the sea, becoming an important place of prayer for sailors departing along the Seto Inland Sea routes.
Kotohira-gu Shrine, widely known as “Konpira-san,” was also revered throughout Japan, attracting countless sailors and merchants praying for safe voyages.
Across the islands of the Seto Inland Sea, shrines dedicated to sea deities and maritime festivals have also been passed down through generations.
At Oyamazumi Shrine, numerous weapons and suits of armor were dedicated by maritime powers and warriors, reflecting its deep reverence as a guardian deity of the sea.
These maritime beliefs continue to preserve the spiritual culture of the Japanese people, who viewed the sea not merely as a transportation route, but as a presence embodying both fear and blessing.
3. A Modern Maritime Route Opened to the World
In the modern era, the Seto Inland Sea became not only the center of domestic distribution, but also an international maritime route connected to the wider world. The opening of ports and the arrival of steamships dramatically transformed the seascape.
The sea became connected to the world
This was the turning point of the modern Seto Inland Sea
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After the opening of Japan’s ports at the end of the Edo period, the country was rapidly integrated into the global economy. The Seto Inland Sea also evolved into an important route supporting international shipping.
Kobe Port developed into an international trading port through the arrival of foreign ships, leading to the creation of foreign settlements and Western-style residential districts.
With the spread of steamships and the development of modern ports, traditional tide-waiting navigation gradually began to disappear.
Moji and Shimonoseki grew into important maritime hubs connecting the Sea of Japan, the Seto Inland Sea, and East Asian shipping routes.
Port cities linked with railways and modern industries also saw the rise of Western-style architecture and new urban landscapes.
In this way, the Seto Inland Sea evolved from a domestic maritime route supporting early modern Japan into a modern sea route open to the world.
Comparison with World Heritage Sites
By comparing the “Historic Districts Around the Seto Inland Sea” with existing World Heritage sites related to maritime trade cities, port heritage, and maritime cultural landscapes, its unique value becomes much clearer. Click or tap the images below to explore these comparisons.
Similarity: Both are maritime networks that supported wide-ranging economic and cultural exchange through sea transportation.
Difference: Malacca was a strait city shaped by international trade and colonial control, while the Seto Inland Sea was an inland maritime network supporting domestic distribution and port town culture.
Similarity: Both preserve the landscape of wooden port towns developed through maritime trade and commerce.
Difference: Bryggen functioned as a single commercial port city, whereas the Seto Inland Sea formed a maritime network linking numerous port towns.
Similarity: Both developed maritime cultures and port landscapes while coexisting closely with the sea.
Difference: Venice was a maritime city centered on a city-state, whereas the Seto Inland Sea represents a broad maritime cultural sphere formed through dispersed port towns and sea routes.
Similarity: Both formed maritime networks in which multiple port cities were connected through sea trade.
Difference: Stralsund was part of a commercial urban alliance shaped by the Hanseatic League, while the Seto Inland Sea was an inland maritime sphere that also included faith, tide-waiting culture, and daily life traditions.
Next, let us compare it with World Heritage sites in Japan. Click or tap the images below to explore these comparisons as well.
Similarity: Both are deeply connected to transportation and distribution networks that supported the economic growth of early modern Japan.
Difference: Iwami Ginzan is an industrial heritage site centered on mining production and export ports, while the Seto Inland Sea represents a maritime transportation network supporting nationwide distribution.
Similarity: Both reflect how reverence toward nature shaped Japanese culture and spirituality.
Difference: Mount Fuji is a sacred center of mountain worship, whereas the Seto Inland Sea represents a maritime faith sphere centered on navigation safety and sea-based exchange.
Similarity: Both are historic sites that supported the Japanese economy and large-scale distribution through maritime transportation.
Difference: The Sado Gold Mines represent industrial heritage focused on mining management and island transportation, while the Seto Inland Sea represents a nationwide maritime transportation network formed by port towns and shipping routes.
Existing World Heritage sites each demonstrate how maritime trade and port cities supported regional economies and cultural exchange. In contrast, the “Historic Districts Around the Seto Inland Sea” are distinguished not by a single port city, but by a vast maritime network formed through the integration of numerous port towns, sacred sites, shipping routes, and islands. It represents a uniquely Japanese inland sea cultural sphere that developed through coexistence with the sea, shaped by the traditions of waiting for tides and winds.
Why These Sites Were Selected
Let us now examine the significance of the “Historic Districts Around the Seto Inland Sea” within Japan itself. The reasons can be summarized in the following three points. Click or tap each section to learn more.
From ancient times to the modern era, the Seto Inland Sea functioned as the great maritime artery connecting eastern and western Japan. Its calm waters and chain of islands created ideal conditions for navigation, leading to the development of interconnected port towns, tide-waiting ports, and strait communities. The continuous preservation of such a broad maritime transportation system is a distinctive feature rarely found elsewhere in Japan.
Along the coasts of the Seto Inland Sea, maritime beliefs praying for safe voyages and abundant catches developed throughout the region. Shrines such as Sumiyoshi Taisha, Kotohira-gu Shrine, and Oyamazumi Shrine are representative examples that gained widespread devotion through their close connection with maritime transportation. These sites were not merely religious institutions, but spiritual anchors for people traveling across the sea, forming cultural landscapes that symbolize the relationship between the Japanese people and the sea.
Port towns such as Tomonoura, Onomichi, Mitarai, Takehara, and Moji still preserve historic landscapes shaped through maritime trade. Harbors, traditional townhouses, stone stairways, lighthouse structures, and shrines remain together as unified historic environments, allowing visitors to clearly understand the history of maritime exchange from the early modern to modern period. Unlike a single port town, the continuous spread of historic districts across the entire sea region is one of the defining characteristics of the Seto Inland Sea.
In this way, this heritage group served for centuries as a central hub of maritime transportation, logistics, faith, and cultural exchange within the Japanese archipelago. Because port towns, sacred sites, and cultural landscapes remain preserved across the entire sea region, it forms a uniquely distinctive historic heritage that allows a comprehensive understanding of the relationship between the Japanese people and the sea.
Components of the property
From here, let us introduce the component sites that make up this proposal.
Please note, however, that these are only representative examples and should not be considered the single “correct” selection.
Early Modern Ports
Faith Connected to the Sea
Modern Ports
Criteria
Now, let us organize these values in relation to the UNESCO World Heritage inscription criteria. By doing so, the significance of the “Historic Districts around the Seto Inland Sea” becomes even clearer.
Interchange of Human Values
A maritime exchange network that continuously connected the Japanese archipelago
This heritage group demonstrates the long history of people, goods, and culture moving widely through the Seto Inland Sea. Port towns, tide-waiting ports, and strait settlements developed through mutual connections, playing a vital role in supporting logistics and cultural exchange within Japan from the early modern to the modern period. The Seto Inland Sea functioned not merely as a shipping route, but as a maritime network that helped unify the Japanese archipelago.
Testimony to a Cultural Tradition
The faith and lifestyle culture of Japanese people who lived alongside the sea
This heritage group preserves Japan’s maritime faith traditions, in which people prayed for safe voyages and abundant catches. Sacred sites such as Sumiyoshi Taisha, Kotohira-gu Shrine, and Oyamazumi Shrine served as spiritual centers for those traveling across the sea. In addition, the historic townscapes and cultural landscapes preserved in port towns and island settlements clearly demonstrate a distinctive Japanese way of life shaped through maritime trade and transportation.
In Closing
The scenery of the Seto Inland Sea often feels calm, as though time itself moves more slowly there.
The islands viewed from a ferry, and the peaceful atmosphere of the port towns, may now simply be familiar sights for travelers.
Yet across these waters, countless ships once sailed, people waited for the tides, and travelers offered prayers to the gods of the sea before their journeys.
The lights of the port towns, the lives of the island communities, and the prayers preserved in shrines are all traces of generations who lived alongside the sea.
When viewed with that in mind, perhaps the scenery of the Seto Inland Sea begins to look a little different.
Known today as a tranquil inland sea, the Seto Inland Sea also served for centuries as a maritime route supporting the logistics, culture, and faith of the Japanese archipelago.
From the modern era onward, it also took on a new role as an international sea route connected to the wider world.
Beyond the ordinary scenery of the sea, these layers of history still remain.
Within the calm scenery of the inland sea, the history of the “maritime artery” that continued to support Japan still lives on today.
A “World Heritage Site” like this—why not?
