Achastle, Caithness
Map Ref: ND 116227

Built in the 15th century the ruins can still be seen.  With walls 70 feet high by 43 feet wide and over 5 feet thick it was a large building.  It was alluded to by Cordiner who wrote in 1788 that two towers were present.  It is situated where the Langwell and Berriedale rivers meet.  It has protection from the steep banks of the rivers on two sides and had a broad ditch on the third.  It was said to have been built by one of the sons of an Earl of Sutherland.