The most mountainous districts are northern Bauchi (a little north of io°), where heights of 6000 to 7000 ft.
In the one province of Bauchi as many as sixty native languages are spoken.
Next in importance among the Hausa towns are Bauchi (or Yakoba), pop. over 50,000, 140 m.
Tin ore of excellent quality is found in the province of Bauchi, alkali salts are abundant in Kano province, iron ore and red and yellow ochres are found in Kontagora and other provinces, kaolin (china clay) and limestone in the west central regions.