The river sand is collected at the mouth of the river to secure the depth of the water.

मौसम-घटनाक्रम / The river sand is collected at the mouth of the river to secure the depth of the water.
प्रकृति-लैंडस्केप / The river sand is collected at the mouth of the river to secure the depth of the water.
परिस्थितिकी / The river sand is collected at the mouth of the river to secure the depth of the water.