Tregiffian is in southwest Cornwall in the District of Penwith south of Penzance between St Buryan and Lamorna.

From the edge of the site a passage, covered by four 3 m long stones, led to the 4-metre deep grave chamber.

In front of the chamber, a cross-lying ornate stone, with cup-and-ring markings, formed a barrier.

Inside the tomb there was the chamber grave, which consisted of upright stones and a cover slab.

[4] Newer research recognized passage tombs as a variant of the dolmen type, notable particularly by the entrance to the interior.