Loch Fada Cùl na Beinne – (The) long loch (in the) corner (or shoulder) of (the) mountain.

Loch Fada Cùl na Beinne closeup No. 1 – A view down from the Beinn Bhreac massive onto the distinctively shaped loch. The ridgeline running away from the foreground, and into the distance on the right of the image, is the diminishing Ceann Min na Beinne na Brice.