An example of an excavated souterrain is the site at Rosal Strath Naver Sutherland.
['is']
['An', 'example', 'of', 'an', 'excavated', 'souterrain', 'is', 'the', 'site', 'at', 'Rosal', 'Strath', 'Naver', 'Sutherland.']