A lough is a term commonly used in Ireland and parts of Scotland to describe a lake or an inlet of the sea. These bodies of water can vary in size and depth, often providing habitats for various wildlife and supporting local ecosystems. Loughs are typically freshwater, but some may have brackish water, which is a mix of fresh and saltwater. Many loughs are popular for recreational activities such as fishing, boating, and birdwatching. Notable examples include Lough Neagh, the largest lough in Ireland, and Lough Corrib, known for its scenic beauty and rich biodiversity.