Open accesson National Trust land that is open on foot at all times
Earthworks onlybanks, ditches and platforms — read the ground, not walls
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Trereen Dinas is a promontory fort in Cornwall. The Albion Guide lists 17 promontory forts in the county; this is one of them. It sits within Cornwall National Landscape National Landscape.
The nearest railway station is St Ives (Cornwall), 8.8 km to the east. Bosigran Castle and Treen Common stone circle are among the ancient sites within 2.3 km.
More at the National Heritage List entry