In Irish mythology and folklore, Tír na nÓg or Tír na hÓige is one of the names for the Celtic Otherworld, or perhaps for a part of it. Other Old Irish names for the Otherworld include Tír Tairngire, Tír fo Thuinn, Mag Mell, Ildathach, and Emain Ablach. Similar myths in the northern Celtic cultures include these of Annwn, Fairyland, and Hy Brasil.