the waters around the island, which was revealed to be the top of a mountain, and the land below that was uncovered became Cambodia. Kaundinya and Soma and their descendants became known as the Khmers and are said to have been the rulers of Funan, Chenla and the Khmer Empire. This myth further explains why the oldest Khmer , or temples, were always built on mountaintops, and why today mountains themselves are still revered as holy places. Arrival in Southeast Asia The Khmers, an Austroasiatic people, are one of the oldest ethnic groups in the area, having filtered into Southeast Asia from southern China, possibly Yunnan, or from Northeast India around the same time as the Mon, who settled further west on the Indochinese Peninsula and to whom the Khmer are ancestrally related. Most archaeologists and linguists, and other specialists like Sinologists and crop experts, believe that they arrived no later than 2000 BCE (over four thousand years ago) bringing with them the practice of agriculture and in particular the cultivation of rice. This region is also one of the first places in the world to use bronze. They were the builders of the later Khmer Empire, which dominated Southeast Asia for six centuries beginning in 802, and now form the mainstream of political, cultural, and economic Cambodia. The Khmers developed the Khmer alphabet, which in turn gave birth to the later Thai and Lao alphabets. The Khmers are considered by archaeologists and ethnologists to be indigenous to the contiguous regions of Isan, southern Laos, Cambodia and South Vietnam. That is to say the Cambodians have historically been a lowland people who lived close to one of the tributaries of the Mekong River. The reason they migrated into Southeast Asia is not well understood, but scholars believe that Austroasiatic speakers were pushed south by invading Tibeto-Burman speakers from the north as evident by Austroasiatic vocabulary in Chinese, because of agricultural purposes as evident by their migration routes along major rivers, or a combination of these and other factors. The Khmer are considered a part of Greater India, owing to them adopting Indian culture, traditions and religious identities. The first powerful trading kingdom in Southeast Asia, the Kingdom of Funan, was established in southeastern Cambodia and the Mekong Delta in the first century, although extensive archaeological work in Angkor Borei District near the modern Vietnamese border has unearthed brickworks, canals, cemeteries