Whistling Sands (Porth Oer) is a sandy National Trust beach at the north-western tip of the Llyn peninsula. The beach is backed by banks of sand and boulder clay, becoming rocky at the northern end. Parking is on grass at a National Trust car park, with a P&D machine for times when it is not attended. There is some space for roadside parking near the lane to the car park. Access to the beach is a walk of about 300 yards further down the lane, where there is a cafe / beach shop almost on the beach. Easier roadside parking can be found by continuing northwards along the lane to its next junction. A little further on, a footpath leads down to the northern end of the beach.
The sand here consists mostly of rounded grains of quartz of a uniform size, which under dry conditions make a squeaky sound when walked upon - hence the name Whistling Sands. Dogs are not allowed between 1st April and 30th September. The welsh name 'Porth Oer' translates as 'Cold Port'.