Lough Swilly is a large sea inlet located in County Donegal, Ireland. It stretches approximately 20 kilometers and is known for its stunning natural beauty, featuring rugged coastlines and lush green hills. The lough is a popular spot for various water activities, including sailing and fishing. The area around Lough Swilly is rich in history and culture. It has been significant since ancient times and is home to several historical sites, including Fort Dunree and Grianan of Aileach. The lough also supports diverse wildlife, making it an important ecological area for both marine and bird species.