Coordinates: 50°44′38″N 4°37′26″W / 50.744°N 4.624°W
St Gennys (Cornish: S. Gwynnas) is a coastal civil parish and small settlement in north Cornwall, England, United Kingdom.
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 population of the parish at the 2011 census was 873.
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 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.