Yet further inland, nomads and settled nomads occupy the higher river basins and the river headwaters between Kalimantan (Indonesia) and Sarawak ; on account of the various migrations throughout history, they often originally come from a valley in a different political zone. Political borders need not therefore be taken into account when looking at the traditional way of life of these populations.

There are over 150 different languages spoken on the island, but, demographic proportions are not in favour of indigenous populations. In 1980 in Sarawak, 30% of the population were Iban, 29% Chinese, 20% Malays, whereas 'other indigenous populations' only made up 5% of total population (KO TEE HOCK 1986).
Various all-embracing names are used to designate several groups that are put together for the purpose : for example, Dayak is the name used by Muslim Malays to designate any non-Muslim Borneo aborigine and in Sarawak it refers only to the Iban (Sea Dayak) and the Bidayuh (Land Dayak) ; in an everyday context it designates all sedentary cultivators, but these same cultivators call Penan the nomad groups or those descending from nomads. Most of these names (such as Iban, Ngaju, Land Dayak, Dusun,...) are used by others, whereas the people themselves refer to their own population with geographical terms. However, these names may also be used to express a cultural identity by opposition to populations coming from the outside (to Malays or Chinese for example).