Nechtan is a figure from Irish mythology, often associated with the sea and water. He is known as a god or deity who presides over the waters, particularly in the context of rivers and lakes. Nechtan is sometimes linked to the Tuatha Dé Danann, a group of supernatural beings in Irish lore, and is often depicted as a wise and benevolent figure. In some stories, Nechtan is credited with the creation of sacred wells and is associated with healing and purification. His name is also connected to various legends that highlight the importance of water in Celtic culture, symbolizing life, fertility, and renewal.