The spectacular Erra Matti Dibbalu that stretches between Visakhapatnam and Bheemunipatnam along the coast is a marvelous gift of nature. The low-lying dunes with a maximum elevation of 90 m above mean sea level (msl) is located 20 km to the northeast of Visakhapatnam and 4 km southwest of Bhimunipatnam. The width of the dunes vary from 200 m to 2 km, running for 5 km along the coast in an east-west direction. Besides being unusual, the rare sand dunes have an important and interesting history of evolution. 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 (Gardner 1995).