The Fula first settled in the area in the 14th century.[1] The nineteenth century Adamawa emirate lay south of Lake Chad, and east of Hausaland, within latitudes 6° and 11° North, and longitudes 10° and 14° East. The external limits are hard to fix in exact terms, because it is difficult to distinguish between people who the Fulani subjected to their rule, and those whom they simply raided for sla
ves, without establishing any form of administrative links. According to some estimates, by the late 19th century, slaves constituted about 50% of the population of the Fulɓe-ruled Adamawa Emirate, where they were referred to as jeyaɓe (singular jeyado). Based on the region subjected to Fulani rule, the emirate stretched from areas south of the Adamawa plateau near Tibati, in the South, to the Diamare, in the north, from the slopes of the Bamenda-Adamawa-Mandara Highlands in the west, to Baya, Laka, Mundang and Musgum country in the east. Early British administrators reporting from Yola, put the surface area of Adamawa at between 35,000 and 40,000 square miles or between 90,650 and 103,600 square kilometers. As a result of European treaties in 1893 and 1894, parts of the Emirate can today be found in Chad, the Central African Republic, Nigeria and Cameroon, which retained about three-quarter of the total area of the Emirate. The altitude of much of the country lies at around 2,000 ft (610 m) above sea level. The Adamawa plateau itself however, called the Lesdi Hossere by the Fulbe, rises to a general elevation of 4,000 ft (1,200 m), and forms the watershed, from which streams of water drain into the Benue river system, as well as into the inland basin of Lake Chad. Great altitudes of between 5,000 and 7,000 ft or between 1,525 and 2,150 meters above sea level are found, towards the western border region of the emirate with other regions of Nigeria and Cameroon, these are sections of the Cameroon-Bamenda-Adamawa-Mandara highland range which have record heights of about 13,350 ft (4,070 m) above sea level near the coast and steadily decreases northwards, to just around 4,000 ft (1,200 m) near Yola, the emirate's capital city. North of Yola, these range of highlands is continued by the Mandara Mountains at over 6,000 ft (1,800 m), before finally tapering out around Balma, into the lake chad basin. The southern regions of the emirate is characterized by thin forest of broad leaved savannah woodland or orchard vegetation type. The country becomes more and more of open
