Loch (/l?x/) is the Irish, Scottish Gaelic and Scots word for a lake or sea inlet.
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The word 'loch' is believed to have been brought to Scotland by the Gaels. Gaels were a Celtic tribe who settled in Scotland, Ireland, and the Isle of Man. 'Loch' was used to describe the many lakes and inlets that are found in the Scottish and Irish landscapes.
'Glen' is the Scottish term for a valley. Many have a U-shape and were gouged into existence by huge glaciers that ground down the mountains. The glaciers finally departed at the end of the last ice age 11,500 years ago.