River sand is obtained by mining the river banks; they are fine grain deposits that contain several minerals. They are preferred fillers and binding agents along with cement and are known for their high workability due to their smoother surface, which creates less friction. River sand is preferred over crushed sand grains as they have a naturally rounded surface, which gives them high bonding properties suitable for construction mortar. Red bajari sand has good drainage that prevents moisture buildup in the structures. River sand is mainly composed of grains of quartz and other minerals and contains a minimal amount of clay that prevents shrinkage, which can cause cracks post-drying. River sand is the finest mortar mixture, making it the first choice for construction.