ADAM’S BRIDGE, or Rama’s Bridge, a chain of sandbanks extending from the island of Manaar, near the N.W. coast of Ceylon to the island of Rameswaram, off the Indian coast, and lying between the Gulf of Manaar on the S.W. and Palk Strait on the N.E. It is more than 30 m. long and offers a serious impediment to navigation. Some of the sandbanks are dry; and no part of the shoal has a greater depth than 3 or 4 ft. at high water, except three tortuous and intricate channels which have recently been dredged to a sufficient depth to admit the passage of vessels, so as to obviate the long journey round the island of Ceylon which was previously necessary. Geological evidence shows that this gap was once bridged by a continuous isthmus which according to the temple records was breached by a violent storm in 1480. Operations for removing the obstacles in the channel and for deepening and widening it were begun as long ago as 1838. A service of the British India Steam Navigation Company’s steamers has been established between Negapatam and Colombo through Palk Strait and this narrow passage.