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Treen (Cornish: Tredhin) is the chief village in the parish of St. Levan, in the far west of Cornwall, England. It is about 3 miles (4.8 km) inland from Land's End on a short unclassified spur road from the B3315. Treen overlooks the Penberth Valley and sits about 1 kilometre (0.62 mi) inland from Treryn Dinas, an Iron Age promontory fort, or cliff castle, with five lines of fortification.
For further information of a genealogical nature and local administration links, see the parish of St. Levan.