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In page Loch:

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This name for a body of water is Insular Celtic[1] in origin and is applied to most lakes in Scotland and to many sea inlets in the west and north of Scotland. The word comes from Proto-Indo-European *lókus ('lake, pool'), and is related to the Latin lacus ('lake, pond'), English lay ('lake') and French lac, as well as the Italian, Portuguese and Spanish word for a lake, lago.[citation needed]