To the east of Porthcurno cove is the imposing and rugged granite headland of Treryn Dinas or Treen Castle. These cliffs are best known as the location of Logan Rock, a naturally occurring 65 ton rock balanced 100ft (30m) above the sea. However, this is also the site of an Iron Age promontory fort which took full advantage of the natural lay of the land.
Protected by sheer cliffs to three sides the landward side was heavily defended by a series of large ramparts and ditches. The largest, of which measured nearly 20ft (6.5m) high and 800ft (250m) long.
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