[2] It is situated on a rocky hill that rises to 678 feet (207 m) above ordnance datum between the valleys of the River Nairn and its tributary the Allt Dearg.

[3] Dun Evan is scheduled by Historic Environment Scotland as a site of national importance.

[3] The small size of the stones of the inner walls of the fort suggest that they were timber-laced.

[2] The fort is surrounded by a series of outer defences further down the flanks of the rock, including a 180 feet (55 m) arc of ruined walling and earthworks to the south west, and a similar 130 feet (40 m) arc to the north east.

[3] Within the north east tip of this second arc is a further defensive wall whose surviving height was measured in 1957 as up to 14 feet (4.3 m), and which extended about 60 feet (18 m) back to the southern apex of the rock[3] This was connected to the outer arc by two parallel radial stretches of wall about 25 feet (7.6 m) to 35 feet (11 m) apart, which together formed a rectilinear plan which may represent a building or reinforcing cross-walls, but appear to have been built on a larger scale than the rest of the defences.