The Girdle of Melian is a magical barrier created by the Maia named Melian in the legendarium of J.R.R. Tolkien. It surrounds the realm of Doriath, protecting it from outside threats and ensuring the safety of its inhabitants, particularly the Sindarin Elves. The girdle is a manifestation of Melian's power and her deep connection to the land. This protective barrier is described as a mystical force that can deter intruders and create a sense of peace within its borders. The Girdle of Melian plays a significant role in the history of Middle-earth, influencing events and characters, including Thingol, the Elven king, and Lúthien, his daughter.