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National geo heritage site.

Such sand deposits have been reported only from three low latitude tropical regions in South Asia—the Teri Sands of Tamil Nadu, the Erra Matti Dibbalu in Andhra Pradesh and Red Coastal Sands of Sri Lanka. They do not occur in any other equatorial or temperate regions across the world. 

The red or orange rock owes its color to microscopic grains of iron oxide minerals (such as hematite and goethite) The iron-rich heavy minerals present in the soil had undergone leaching by surface water and were then oxidised because of the favourable semi-arid climatic conditions.

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