Comprising the territories of Malaya, Sarawak, and Sabah, Malaysia stretches from peninsular Malaysia to northeastern Borneo in Southeast Asia. Central mountains divide peninsular Malaysia (Malaya), separating the narrow eastern coast from the fertile western plains, with its sheltered beaches and bays. Sarawak and Sabah share the island of Borneo with Indonesia and Brunei, where swamps rise to jungle-covered mountains. Malays make up half the population, and almost all Malays are Muslims. Ethnic Chinese constitute a quarter of Malaysia's people, and Indians some 7 percent—both groups are concentrated on the peninsula's west coast.