Porth Neigwl (Hell’s Mouth)

Porth Neigwl, known as Hell's Mouth, stretches for nearly four miles along the exposed southwest coast of the Llyn Peninsula — a vast, wild beach backed by dunes and open farmland with no facilities and no crowds. The bay faces directly into the Atlantic swell, and the combination of pebbles at the tideline giving way to enormous expanses of firm sand at low tide creates a landscape that feels properly remote. The headlands at either end frame a scene of raw coastal grandeur that few Welsh beaches can match.

Dogs are welcome year-round on this exceptional dog friendly beach, and the sheer scale means off-lead running is possible in every direction with room to spare. The firm low-tide sand provides outstanding ground for long walks and sprints, while the tideline and dune edges offer rich scenting territory. Strong undertows and surf make swimming risky for dogs as well as people, so confident water dogs need watching here. As a space to run, explore, and experience the full force of the Atlantic coast, Hell's Mouth is hard to beat anywhere in Wales.