Cleeve Hill is a 15.1 hectare

Hectare

The hectare is a metric unit of area defined as 10,000 square metres , and primarily used in the measurement of land. In 1795, when the metric system was introduced, the are was defined as being 100 square metres and the hectare was thus 100 ares or 1/100 km2...

 (37.4 acre) biological Site of Special Scientific Interest between Old Cleeve

Old Cleeve

Old Cleeve is a village and civil parish south east of Minehead in the West Somerset district of Somerset, England. The civil parish of Old Cleeve covers an area of and includes the villages of Blue Anchor, Roadwater and Washford as well as hamlets such as Bilbrook, Chapel Cleeve, Golsoncott and...

 and Watchet

Watchet

Watchet is a harbour town and civil parish in the English county of Somerset, with an approximate population of 4,400. It is situated west of Bridgwater, north-west of Taunton, and east of Minehead. The parish includes the hamlet of Beggearn Huish...

 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...

, notified in 1989.

The site covers a moderate to steeply sloping south face of the Washford River Valley. It supports a rich and diverse calcareous grassland

Grassland

Grasslands are areas where the vegetation is dominated by grasses and other herbaceous plants . However, sedge and rush families can also be found. Grasslands occur naturally on all continents except Antarctica...

 community with associated mixed woodland and scrub. The site contains two species of plant which are nationally rare in Great Britain, Nit-grass (Gastridium ventricosum) and Rough Marsh-mallow (Althaea hirsuta).