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The fertile floodplain and tropical monsoon climate, ideally suited to wet-rice (tham na) cultivation, attracted settlers to this central area over to the marginal uplands and the highlands of the northern region or the Khorat Plateau to the northeast.By the 11th century AD, a number of loosely connected rice-growing and trading states flourished in the upper Chao Phraya Valley. They broke free from domination of the Khmer Empire, but from the middle of the 14th century gradually came under the control of the Ayutthaya kingdom at the southern extremity of the floodplain.

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12y ago

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