Porthallack Beach Maps beach info maps weather & tides Select a map type from the following providers. All are at the same location and to the same scale Standard Map Satellite Map OS Map How to get to Porthallack Beach Probably the best way to access Porth Sawsen is to walk down the wooded Carwinion valley from Mawnan Smith. It is a little under a mile (about 1 km) from the village and a highly recommended scenic walk. Nearest town Falmouth Postcode TR11 5HX OS grid ref. SW 7819 2696