Ram Sethu:
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Ram Sethu is also known as Adam’s Bridge or Nala Sethu.
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It is a 48 km chain of limestone shoals between Pamban Island known as Rameswaram Island on the coast of Tamil Nadu, India, and Mannar Island on the coast of Sri Lanka.
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The bridge separates the Gulf of Mannar (south-west) from the Palk Strait (northeast).
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The bridge holds religious significance. A bridge is mentioned in Ramayana, that Lord Ram and his army built to reach Lanka. The location of the Lanka of the Ramayana has been widely interpreted as being current day Sri Lanka and bridge as Ram Sethu.