St Mary's Loch

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St Mary's Loch
Location Borders, Scotland
Coordinates 55°29′40″N, 3°11′10″WCoordinates: 55°29′40″N, 3°11′10″W
Lake type freshwater loch
Basin countries United Kingdom
Max. length 5 km
Max. width 1 km

St Mary's Loch is the largest natural loch in the Scottish Borders Region and is situated about 72 km south of Edinburgh on the A708 road between Selkirk and Moffat in the valley of the Yarrow. It is 5 km long and 1 km wide. Local legend has it that the loch has no bottom. Immediately upstream from St Mary's Loch is The Loch of the Lowes, a smaller lake. Between the two is situated Tibbie Shiels Inn. The Southern Upland Way crosses between the two lochs.

The loch was created by glacial action during the last ice age.

A few miles further on the road towards Moffat The Grey Mare's Tail, the 5th highest waterfall in the UK, can be seen to the north of the road.