The parish of Altarnun includes the village of Fivelanes and the hamlets of Bolventor, Treween and Trewint, and had a population of 976 according to the 2001 census. The moorland area of the parish is large and lies west of the village towards Rough Tor and southwards towards Dozmary Pool. The village is in the valley of the Penpont Water and the parish is divided by the A30 trunk road which passes through Fivelanes.