Donegal Bay (Erne) is a coastal waterbody on the south coast of County Donegal, facing west into the Atlantic Ocean. The bay is characterized by a long, sandy beach at Rossnowlagh, which extends for approximately 2,150 meters and is confined by Coolmore cliffs to the south and the area of Inishfad and Durnesh Lake to the north. This beach serves as a primary access point for launching and landing paddlecraft. The bay receives a strong wash of water from the Atlantic, indicating significant exposure to ocean swells and wind. This creates conditions suitable for surfing, with several surf schools operating on the beach, particularly in summer. Paddlers should anticipate a dynamic marine environment with potential for surf zones at the beach entry and exit points. The area is used for a variety of marine activities including kayaking, sailing, power boating, and jet skiing, with specific regulations for craft defined in the Maritime Craft Bye Laws, particularly regarding designated areas. The water quality status of Donegal Bay (Erne) is classified as 'High' based on recent monitoring. The surrounding area is rural but features an extensive network of houses and caravan parks, suggesting some visitor amenities are available near the beach. The bay is part of a larger hydrological system and is designated as both a Special Area of Conservation (SAC) and a Special Protection Area (SPA).