A freighter threads its way through the Turku Islands in Finland's Archipelago Sea. There are more than 25,000 islands in the Archipelago Sea. Some of the islands are close enough to be connected by bridges.

Photograph by George F. Mobley

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archipelago
archipelago Encyclopedic Entry

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4-12+

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Religion, Geography, Science

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Encyclopedic entry. An archipelago is a group of islands closely scattered in a body of water. Usually, this body of water is the ocean, but it can also be a lake or river.

sea
sea Encyclopedic Entry

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5-12+

Subjects
Religion, Geography

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People often use the term “sea” to refer to the ocean. To geographers, a sea is a division of the ocean that is enclosed or partly enclosed by land.