Grabbist hillfort is an Iron Age

Iron Age

The Iron Age is the archaeological period generally occurring after the Bronze Age, marked by the prevalent use of iron. The early period of the age is characterized by the widespread use of iron or steel. The adoption of such material coincided with other changes in society, including differing...

 oval hillfort west of Dunster

Dunster

Dunster is a village and civil parish in west Somerset, England, situated on the Bristol Channel coast south-southeast of Minehead and northwest of Taunton. The village has a population of 862 .The village has numerous restaurants and three pubs...

 in Somerset

Somerset

The ceremonial and non-metropolitan county of Somerset in South West England borders Bristol and Gloucestershire to the north, Wiltshire to the east, Dorset to the south-east, and Devon to the south-west. It is partly bounded to the north and west by the Bristol Channel and the estuary of the...

, England. The fort is 885.8 feet (270 m) long and 219.8 feet (67 m) wide, and is surrounded by a counterscarp

Counterscarp

A scarp and a counterscarp are the inner and outer sides of a ditch used in fortifications. In permanent fortifications the scarp and counterscarp may be encased in stone...

, which measures 4.2 to 6.2 ft (1.3 to 1.9 m) in height. It is also surrounded by a ditch, which ranges up to 32.8 feet (10 m) wide and 7.2 feet (2.2 m) deep. The bank has a peak height of 3 metres (9.8 ft), and, on the northern and western sides, there is a second bank, which leads to the northeastern corner being the most strongly defended.