Ballymastocker Beach, also known as Portsalon Beach, is a stunning beach located on the Fanad Peninsula in County Donegal, Ireland. It is known for its crystal clear waters, soft golden sand, and breathtaking views of the surrounding hills and coastline.

The beach is approximately 3.2 km long and is backed by sand dunes that are home to a variety of wildlife, including rabbits and birds. It is also a popular spot for swimming, surfing, kayaking, and fishing.

Ballymastocker Beach has been voted one of the most beautiful beaches in the world by numerous publications, including The Observer and The Irish Times. The beach was also used as a filming location for the movie "The Secret of Roan Inish."

In addition to its natural beauty, the beach is also close to several amenities, including a golf course, a pub, and a restaurant. There are also several hiking trails in the area, including the scenic walk along Knockalla Mountain.

Overall, Ballymastocker Beach is a must-visit destination for anyone traveling to Donegal, Ireland. Its natural beauty and serene atmosphere make it the perfect spot for a relaxing day by the sea.