Between Penmaenpool and Dolgellau the Mawddach to Barmouth walk passes through an avenue of trees with reed beds at either side of the trail. The reeds are easily 3 m (10 ft) tall and provide large areas of cover for wildlife, indeed it is one of the largest areas of common reed in Wales. The reed beds and surrounding wetlands are an important breeding ground for otters and wetland birds such as the red-breasted merganser and the redshank.