Porthallack is the situated on the northern banks of the Helford River. It is the closest beach to the river mouth, which also possibly qualifies it as being one of the remotest spots on the river. Access is only possible via the coast path or by walking around a mile from the village of Mawnan Smith.
Unsurprisingly Porthallack is generally a very quiet spot. It's not a big beach, but it's in a pretty location and there is also the passing river traffic for entertainment.
The beach sits at the bottom of the Trerose estate and is much like a smaller version of Porth Sawsen around the corner; right down to the boat house at the western end. It has the same flat pebbles too.