Cronk-ny-Fannag is a round cairn now mutilated and grass covered but with stone evident in places on its flat top. Kerbing is visible intermittently around the circumference and the whole is fairly prominent and in reasonable condition. The cairn stands on the highest point of a field that slopes gently to the east.  It is approximately 13.0 metres diameter and on the downhill side has a maximum height of 1.0 metre.