Chapel Carn Brea is an elevated granite

Granite

Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...

 outcrop at the northern edge of the civil parish

Civil parish

In England, a civil parish is a territorial designation and, where they are found, the lowest tier of local government below districts and counties...

 of St Buryan

St Buryan

St Buryan is a civil parish and village in Cornwall, United Kingdom.The village of St Buryan is situated approximately five miles west of Penzance along the B3283 towards Land's End...

, Cornwall

Cornwall

Cornwall is a unitary authority and ceremonial county of England, within the United Kingdom. It is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar. Cornwall has a population of , and covers an area of...

, United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. It is three miles (5 km) south of St Just

St Just in Penwith

St Just is a town and civil parish in Cornwall, England, United Kingdom. The parish encompasses the town of St Just and the nearby settlements of Trewellard, Pendeen and Kelynack: it is bounded by the parishes of Morvah to the north-east, Sancreed and Madron to the east, St Buryan and Sennen to...

 and two miles (3.5 km) east of Sennen Cove

Sennen Cove

Sennen Cove is a small coastal settlement in the parish of Sennen, in Cornwall, United Kingdom. According to the Penwith District Council, the population of this settlement was estimated at 180 persons in 2000.-Geography:...

. It should not be confused with Carn Brea

Carn Brea

Carn Brea is a civil parish and hilltop site in Cornwall, United Kingdom. The hilltop site is situated approximately one mile southwest of Redruth.-Neolithic settlement:...

 hill overlooking the Camborne-Redruth area

Chapel Carn Brea is often described as the first hill in Cornwall (from a westerly perspective) and rises 657 feet/200 Metres above sea level. The hill is an important historical site showing evidence of neolithic activity, as well as the remains of the chapel from which it is named.
During the second world war the summit housed a Royal Air Force

Royal Air Force

The Royal Air Force is the aerial warfare service branch of the British Armed Forces. Formed on 1 April 1918, it is the oldest independent air force in the world...

radar, a plaque is dedicated at the bottom of the hill near the carpark to those that served there.