Malaysia has a population density of Malaya. Western coastal plains. The population is about 82 per cent, followed by the northeast coast. In the island of Borneo. Population density. The southern coastal plains of the state of Sarawak. Malaysia has a multi-ethnic area of the river. There are a few tribes in the state of Sabah and Sarawak, resulting in a mixed ethnic descent. Such as Malay, Indian, Chinese.