Lough Foyle is a large estuary located on the border between Ireland and Northern Ireland. It flows into the Atlantic Ocean and is approximately 20 kilometers long. The estuary is known for its rich biodiversity, including various species of fish and birds, making it an important area for wildlife. The surrounding region features picturesque landscapes and several small towns, such as Moville and Greencastle. Lough Foyle is also significant for local fishing and tourism, attracting visitors who enjoy activities like boating and birdwatching. Its waters are vital for the local economy and ecosystem.