The Arthog Waterfalls are a series of cascades carried by the Afon Arthog down the southern shore of the Mawddach Estuary in North Wales, near the small village of Arthog and within Snowdonia National Park.

The river descends through a steep, wooded ravine — described as a Celtic rainforest — dropping over falls that reach roughly 10 metres in height before passing through smaller pools and hidden gullies.

The falls sit at the foot of the Cadair Idris ridge and are easily combined with walks to nearby Cregennan Lakes or along the Mawddach Trail.

Despite their dramatic character, particularly after heavy rain, the waterfalls remain relatively tucked away behind dense woodland and traditional stone walls, making them a quiet and rewarding find for walkers exploring this stretch of the estuary.