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'''Tad Xay and Pha Xay''' are considered to be the most beautiful waterfalls of [[Phou Khao Khouay National Protected Area]] (PKK). They are actually two falls within less than a kilometer. The stream [[Houay Xay]] has its source in the northern mountains of the park, meanders
By reaching Tad Xay, the crystal clear waters [[Houay Xay]] are cascading over seven 1-3 meter steps, and then flowing in a sharp curve to the left through a picturesque small valley, just to plunge only 800 meters downstream over a steep 50 meters cliff info a breathtaking forested gorge.