Porth Nanven

Porth Nanven (grid reference SW355307; most well known as Cot Valley and occasionally known as Penanwell) is a beach in the far west of Cornwall, England, United Kingdom.

The beach is at the seaward end of the Cot Valley and is part of the Aire Point To Carrick Du Site of Special Scientific Interest.

[1][2] Porth Nanven has sometimes been referred to as 'Dinosaur Egg Beach' in the media because of a remarkable deposit of ovoid boulders covering the beach and foreshore.

These boulders come in all sizes, from hen's egg to a metre or more in length, and have proved so tempting as souvenirs that they are now legally protected by the National Trust which owns the beach.

Work was completed in December 2005 on diverting and treating the sewage which used to be deposited offshore here; it is now safe to swim in the cove.