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Phu Chong Na Yoi National Park covers an area of 687 km² over mountainous areas in the province. The park is where Thailand borders Laos and Cambodia. Visitors are recommended to take hiking trails which lead on to the high plateau. ... Before the late eighteenth century, this area evidently was outside siamese or thai Ayutthaya Kingdom. After the fall of Ayutthaya in 1767 several new tribes settled there, including the Kha and Suai. Siamese/ Thai began expand its ...