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island
Eilean Donan Castle on Eilean Donan Island, near the point where the sea lochs Loch Duich, Loch Alsh and Loch Long meet. Credit: Wikimedian Eusebius (Guillaume Piolle).

island:

A body of land, smaller than a continent, that is completely surrounded by water. Curving chains of islands are called island arcs.