The hamlet of St Gennys is about seven miles (11.3 km) southwest of Bude. It is on high ground half-a-mile north of the coastal village of Crackington Haven, the major settlement in the parish. The only other settlements of any size in the parish are Middle Crackington and Higher Crackington both of which are southeast of Crackington Haven, half-a-mile and one mile distant respectively.
The parish is in Stratton Registration District and the population was 873 in the 2011 census. Several places in the parish are mentioned in the Domesday Book including Crackington (as Crachemua), Dizzard (as Disart) and St Gennys itself (as Sainguinas or Sanwinas)
Away from the coast, St Gennys parish is entirely rural. It is bordered to the north by Poundstock parish, to the east by Jacobstow parish, to the south by Otterham and St Juliot parishes. To the west, St Gennys is bounded by the Atlantic coast where Cornwall's highest cliff (appropriately named High Cliff) rises 735 feet (224 m) above the rocky foreshore. Cambeak is a prominent headland and the cliffs at the Strangles are a National Trust property. In one year in the 1820s it is believed 23 ships were wrecked on this part of the coast.
St Gennys lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park.
The manor of St Gennys was recorded in the Domesday Book (1086) when it was one of several manors held by Jovin from Robert, Count of Mortain; before 1066 it had been held by Gytha who also held Poundstock. There was half a hide of land and land for 10 ploughs. There were 3 ploughs, 3 serfs, 2 villeins, 8 smallholders, 40 acres of pasture, 7 cattle, 40 sheep and 6 goats. The value of the manor was £1 sterling.
The parish church is situated on a sloping site in St Gennys hamlet at grid reference . It is dedicated to Saint Genesius. The building is partly Norman with a short one-stage tower topped by a pyramidal roof. The tower houses a ring of four bells. The church was restored in 1871. The arcades of the aisles are partly in granite and partly in Polyphant stone.
Laurence Braddon (died 1724), was an English politician and writer, the second son of William Braddon of Treworgy in St Gennys.
- Place-names in the Standard Written Form (SWF) : List of place-names agreed by the MAGA Signage Panel. Cornish Language Partnership.
- Ordnance Survey: Landranger map sheet 190 Bude & Clovelly ISBN 978-0-319-23145-6
-  GENUKI website: St Gennys. Retrieved May 2010
-  Cornwall Council online mapping. Retrieved May 2010
- AA Book of the Seaside: a mile-by-mile guide to Britain's coastline. London: Drive Publications; pp. 98-99
- Thorn, C. et al., ed. (1979) Cornwall. Chichester: Phillimore; entry 5,7,9
- Berry, Christopher (2002). The Church in St Gennys.
- The St Gennys Gazette
Media related to St Gennys at Wikimedia Commons