Natural wonders of the Mekong River The amazing natural phenomenon Recently been discovered in the northeast. Along the river was a large fine sand-like crystals with curved serpent slithering through the flick. Is shown clearly in the village of Sai sang Kom District , Nong Khai Province. Become Perak Roddenberry Talk of The Town for tourists and solution of a puzzle. Indeed, caused waves in the river. Borne out sand and silt was deposited at this point.