Ethnic Malays which make up the majority population of Malaysia at 50.4%, are an ethnic group of Austronesian people predominantly inhabiting the Malay Peninsula, including the southernmost parts of Thailand, the east coast of Sumatra, the coast of Borneo, and the smaller islands which lie between these locations. The true origin of ethnic Malays is still the subject of studies among historians, anthropologists and linguists. A popular theory suggested that the people who spoke Austronesian languages first arrived in Maritime Southeast Asia between 2,500BCE and 1,500BCE, as a part of Austronesian expansion from Taiwan to South East Asia.