They formerly extended further west almost to the sea-board of the Atlantic; their northern and eastern extension can also be deduced from what is known of their migrations. Their neighbours to the south are the negroid Kanuri, Hausa-speaking peoples,[17] and the Fulani; to the east are the Tebu, and in the west the Arab and Moorish tribes; finally, in the north the nomadic and sedentary Arabs and sedentary Libyans of Algeria, Tunisia and Tripolitania. The N.E. corner of Tuareg territory, the Fezzan, is ethnically of such mixed population as to admit of no summary classification; Arab, Libyan, Tebu and negroid peoples are all inextricably mingled together. The Tuareg wander as nomads over the country generally, the negroes and sedentary Libyans till the ground, and, in addition to a proportion of all those already enumerated, the towns are inhabited by yet another people of noble origin, whose connection with the ancient Garamantes of classical authors may be assumed if it cannot be proved. With the exception of the Fezzan the Tuareg are now predominant within their own country. It includes two great groups of mountains, Air and Ahaggar, together with certain smaller adjacent massifs. It is unfortunately not possible to deal with Air in history nor with the Tuareg of Air, by considering the mountains and their inhabitants alone. The migrations of the Tuareg of Air have been so intimately connected with that part of the Sudan which we now call Nigeria that the northern fringe of the area and the country intervening between it and Air must receive attention. This intervening steppe and desert, largely overrun by Tuareg, lie on the way which I followed to reach the mountains. The neglect to which these areas have been subjected justifies me in devoting a chapter to them before coming to Air itself. Again, the concluding chapters of this volume will deal as much with the Southland as they do with Air, for the history of the latter cannot be divorced from that of the former. Since mention will be continually made of the various Tuareg groups as they exist to-day, and of the tribes which they contain, it will be as well to explain that there are to-day four principal divisions of the people, all of whom possess characteristics common and peculiar to the whole race. The main groups are:— 1. The People of Ahaggar, called Ahaggaren, or Kel Ahaggar. 2. The Azjer, or Azger Tuareg; this name is also spelt Askar, Adjeur, etc. 3. The People of Air called the Kel Air, or, in the Hausa language which is current in that country, Asbenawa or Absenawa, from Asben, Azbin or Absen, the Sudanese name for Air. 4. The Tuareg of the south-west.