@fitheach - could be any Scottish loch, but I'll hazard a guess at Loch Maree..?
It is Loch Lòchaidh (Lochy) which sits in An Gleann Mòr (the Great Glen). It lies in a general south west to north east direction. When I took the photograph I was at the north east end. There is a hamlet there called Laggan, which has a set of canal locks, forming part of the Caledonian Canal.
Photographed using my smartphone.
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