Ghulfan a.k.a. Gulfan, Uncu, Uncunwee, Wunci, or Wuncimbe is a Hill Nubian language spoken in the Nuba Mountains of Sudan, like Karko and Dilling. This is a type of dance commonly performed in the Nuba Mountains and called
kirang; this particular
kirang is performed by people who speak and are singing in Ghulfan:
https://www.youtube.com/watch?v=X6bKOZ3_7hI