This type of sand is everywhere in the plain of the river caused by the tide had blown sand from anywhere. Come together in a sand sedimentation basin source used in construction because it is popular clean sand grain are angled corner of different sizes from through the sieve used in construction. Such as structural, plaster, mortar, the river sand with a mixture of organic compounds are ำดำ and very dark brown used in construction, but was sprinkled on the face of the earth before the popular lawn and use land reclamation for is called The sand fills.