When we look at the human inhabitants of the island there is also a considerable field for research, and some puzzling problems are presented. While Madagascar may be correctly termed "the great _African_ island" as regards its geographical position, considered ethnologically, it is rather a Malayo-Polynesian island. Though so near Africa, it has but slight connection with the continent; the customs, traditions, language, and mental and physical characteristics of its people all tend to show that their ancestors came across the Indian Ocean from the south-east of Asia. There are traces of some aboriginal peoples in parts of the interior, but the dark and the brown Polynesians are probably both represented in the different Malagasy tribes; and although scattered somewhat thinly over an island a thousand miles long and four times as large as England and Wales, there is substantially but one language spoken throughout the whole of Madagascar. Of these people, the Hova, who occupy the central portion of the interior high-land, are the lightest in colour and the most civilized, and are probably the latest and purest Malay immigrants. Along the western coast are a number of tribes commonly grouped under the term Sàkalàva, but each having its own dialect, chief, and customs. They are nomadic in habits, keeping large herds of cattle, and are less given to agriculture than the central and eastern peoples. In the interior are found, besides the Hova, the Sihànaka, the Bétsiléo, and the Bàra; in the eastern forests are the Tanàla, and on the eastern coast are the Bétsimisàraka, Tamòro, Taisàka, and other allied peoples. From a remote period the various Malagasy tribes seem to have retained their own independence of each other, no one tribe having any great superiority; but about two hundred years ago a warlike south-western tribe called Sàkalàva conquered all the others on the west coast, and formed two powerful kingdoms, which exacted tribute also from some of the interior peoples. Towards the commencement of the present century, however, the Hova became predominant; having conquered the interior and eastern tribes, they were also enabled by friendship with England to subdue the Sàkalàva, and by the year 1824 King Radàma I. had established his authority over the whole of Madagascar except a portion of the south-west coast.