The coastal cliff formations are the result of the erosion of oolitic rock beds located to the west of the entrance to Loch Bay.
The first arch is visible at the end of the trek while descending from the ridge and looks as if it is opening into the sea and the second one is hidden.
The openings created by wave action have been likened to cave entrances that "lead to another planet.
[7] One of the formations is a pyramidal mass of rock, perforated through the middle by an unusually shaped arch (called the "keyhole"[1]), and surmounted by the solitary shaft of a basaltic pillar.
Wild goats, golden eagles, breeding fulmars, and kittiwakes frequent the area.