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River sand is a type of sand variant that comes from rivers and has a diameter that is not too large but not too small. This sand can be mined directly from rivers and is generally the result of the erosion of river rocks which are hard and sharp. Sand is in the form of granules which have different textures for each type. In Indonesia, sand has many variations in each region or region, such as in Java there are many mountains, so a lot of sand is produced from mountain mines.