Question: In what region of Africa is the country where the  Tartit (meaning "union"), band from the Tombouctou Region were formed located?
Sentence (from "Mauritania"): Mauritania ( ; Arabic: موريتانيا‎ ‎ "Mūrītānyā "; Berber: or Agawej ; Wolof: "Gànnaar" ; Soninke: "Murutaane"; Pulaar: "Moritani"; French: "Mauritanie" ), officially the Islamic Republic of Mauritania, is a country in the Maghreb region of western Africa.
Relevant evidence: Yes