Adam's Bridge is approximately 48 km (30 mi) long. Records indicate that Adam's Bridge was completely above sea level until a cyclone in 1480 broke it apart, sending sections beneath sea level.
Wikipedia contributors, "Adam's Bridge," Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Adams_Bridge&oldid=967477609 (accessed July 16, 2020). IMAGE: By National Aeronautics & Space Administration - http://eol.jsc.nasa.gov, Public Domain, https://commons.wikimedia.org/w/index.php?curid=11087505