Trá Oilí (Elly Bay, Belmullet) in County Mayo, is a beautiful long strand located on the east side of the Mullet Peninsula in the bay of the same name, Elly Bay. The water is ideal for swimming due to its sheltered location. The beach also attracts surfers during the autumn and winter months.

Trá Oilí (Elly Bay, Belmullet) and Elly Bay is of international ecological importance because of the diverse habitats that can be found in the area. It is also a vital area for local birdlife.