ADAM'S Bridge

Adam's Bridge  also known as Rama's Bridge or Ram Setu , is a chain of limestone shoals, between the islands of Rameswaram, off the southeastern coast of Tamil Nadu, India, and Mannar, near northwestern Sri Lanka. Geological evidence indicates that this bridge is a former land connection between India and Sri Lanka.

The bridge is 30 miles (48 km) long and separates the Gulf of Mannar (southwest) from the Palk Strait (northeast). Some of the sandbanks are dry and the sea in the area is very shallow, being only 3 ft to 30 ft (1 m to 10 m) deep in places, which hinders navigation.

The bridge was first mentioned in historical works in the 9th century by Ibn Khordadbeh in his Book of Roads and Kingdoms (ca. 850 AD) and was called Set Bandhai or "Bridge of the Sea".. Later Alberuni described it.