Ethnic composition Southeast Asia’s population includes a wide variety of ethnic groups and cultures. This diversity is related to its position as a focus of converging land and sea routes. In addition, over the span of human habitation, the region alternately has been a bridge and a barrier to the movement of people. The peopling of Southeast Asia took place through various southward migrations. The initial peoples arrived from the Asian continental interior. Successive movement displaced these initial settlers and created a complex ethnic pattern. On the mainland the Khmer peoples of Cambodia remain as ancestors of earlier Pareoean peoples. Similarly, remnants of the Mon group are found in parts of Myanmar and Thailand; the ethnic mixture there has been produced by overlaying Tibeto-Burman and Tai, Lao, and Shan peoples. The contemporary Vietnamese population originated from the Red River area in the north and may be a mixture of Tai and Malay peoples. Added to these major ethnic groups are such less numerous peoples as the Karens, Chins, and Nāgas in Myanmar, who have affinities with other Asiatic peoples. Insular Southeast Asia contains a mixture of descendants of Proto-Malay (Nesiot) and Pareoean peoples who were influenced by Malayo-Polynesian and other groups. In addition, Arabic, Indian, and Chinese influences have affected the ethnic pattern of the islands. In modern times the Burmans account for more than two-thirds of the ethnic stock of Myanmar, while ethnic Thais and Vietnamese account for about four-fifths of the respective populations of those countries. Indonesia is clearly dominated by the Javanese and Sundanese ethnic groups, while Malaysia is more evenly split between the Malays and the Chinese. Within the Philippines, the Tagalog, Cebuano, Ilocano, and Bicol groups are significant.