Great Treffgarne Rocks ia an oval enclosure, measuring c.80m by 50m, and defined by double banks and ditches to the west and south, scarping to the south-east and precipitous crags above the Western Cleddau to the north and east. There is an entrance in the south facade and reports of 'crude walling' to the south-east.

There is a second defended enclosure (Nprn305202) 210m to the north-west, and unenclosed roundhouse platforms (Nprn305201) 90m to the west.

(source Os495card; SM92NE1)

J.Wiles 11.09.03