Seto Inland Sea Map
The Seto Inland Sea is a sea of about 19,700 km² (7,610 sq mi), bordered by Japan. This map shows the Seto Inland Sea highlighted in blue on shaded relief, with the surrounding coasts, rivers, borders and major cities.
How to read this map
The Seto Inland Sea covers about 19,700 km² (7,610 sq mi) and reaches a maximum depth of about 105 m (344 ft). Countries with a coast on the Seto Inland Sea: Japan.
The blue outline marks the Seto Inland Sea as mapped by Natural Earth. Towns and cities on the map include Osaka, Busan, Nagoya, Fukuoka, Hiroshima, Kyoto, Kōbe and Kitakyūshū.
Greens show lower elevations; tan and brown show higher land, with pale tones toward the highest terrain. Shadows emphasize the slopes, and vertical relief is exaggerated so landforms are easier to read. Dashed lines show country borders.
The relief uses Terrain Tiles (SRTM, GMTED2010 and ETOPO1 elevation data). Rivers, lakes, borders and the outline of the Seto Inland Sea come from Natural Earth, and the figures on this page from Wikidata. Natural Earth draws features at a small scale, so the outline is a guide to where the Seto Inland Sea is, not a surveyed boundary.
Blank physical map
The blank version keeps the mapped features and removes the place labels. Download it for a geography worksheet or practice identifying the features.
Seto Inland Sea facts
| Fact | Value |
|---|---|
| Area | 19,700 km² (7,610 sq mi) |
| Maximum depth | 105 m (344 ft) |
| Body of water | the Pacific Ocean |
| Inflows | Ōta River, Ashida River, Aibiki River, Asahi River, Aya River, Doki River, Kamo River and Kanakura River |
| Coastal countries | Japan |
Data sources and license
- Natural Earth (public-domain geography): Public domain.
- Terrain Tiles / Mapzen (SRTM, GMTED2010, ETOPO1): Open elevation data; source attribution retained.
- Wikidata (lengths, areas, countries and other facts): CC0 1.0.
Map design and rendered images: Atlas of Maps, CC BY 4.0. Source databases retain their own licenses; the map license does not replace them.
Maps of the coastal countries: Japan. Compare with the map of the five oceans.
Frequently asked questions
How big is the Seto Inland Sea?
The Seto Inland Sea covers about 19,700 km² (7,610 sq mi); its maximum depth is about 105 m (344 ft).
Which countries border the Seto Inland Sea?
Japan.
Can I download a blank map of the Seto Inland Sea?
Yes. The blank version keeps the relief, rivers and borders and the highlighted sea but removes the place names. Both versions are free to download as PNG and as an A4 PDF.
Use this map
You can download, print and share this map for free, in class, in school projects, in presentations and on websites, as long as you credit the source: Seto Inland Sea Map · Atlas of Maps (atlasofmaps.com), license CC BY 4.0.
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