The International Hydrographic Organization's definition of the limits of the Seto Inland Sea (published in 1953) is as follows: See more

Over 500 marine species are known to live in the Seto Inland Sea. Examples are the ayu, an amphidromous fish, horseshoe crab, finless porpoise, and great white shark, which has occasionally attacked people in the Seto Inland Sea. In the past, whales entered … See more

Major cities with heavy industrial activity on the coast of the Seto Inland Sea include Osaka, Kobe, and Hiroshima. Smaller scale manufacturing and industry can also be found in Kurashiki, Kure, Fukuyama, and Ube in Honshū, and Sakaide See more

The coastal area of the Seto Inland Sea is one Japan's major tourist destinations. Even before the country opened to foreigners in the middle of the 19th century, the sea's … See more

The Seto Inland Sea is 450 km (280 mi) long from east to west. The width from south to north varies from 15 to 55 km (10 to 34 mi). In most … See more

During the last ice age, the sea level was lower than today. After the ice age, sea water poured into a basin between the Chūgoku mountains and Shikoku mountains and … See more

Today the Seto Inland Sea serves its coastal areas mainly for two purposes: first, international or domestic cargo transportation, and … See more