In ADF terms, the triad of deities, ancestors, and nature spirits is called the "Three Kindreds". There are other triads in ADF practice, such as the "three realms" of the Underworld (associated with the ancestors), the Heavens (associated with the gods), and this world (associated with the nature spirits); these are similar to the three worlds of the Celts, and to the Norse realms of Niflheim, Asgard, and Midgard. There are also three parts to this world; the Land, the Sea (including saltwater and freshwater bodies), and the Sky.