The Palk Strait is a strait between the Tamil Nadu state of India and the Mannar district of the Northern Province of the island nation of Sri Lanka. It connects the Bay of Bengal in the northeast with Palk Bay in the southwest. The strait is 53 to 82 kilometres (33 to 51 mi) wide. Several rivers flow into it, including the Vaigai River of Tamil Nadu. The strait is named after Robert Palk, who was a governor of Madras (1755–1763) during the Company Raj period.

Palk Bay is studded at its southern end with a chain of low islands and reef shoals that are collectively called Adam's Bridge, since ages it is popularly known in Hindu Mythology as "Ram Setu" i.e. The Bridge of Rama. This chain extends between Dhanushkodi on Pamban Island (also known as Rameswaram Island) in Tamil Nadu and Mannar Island in Sri Lanka. The island of Rameswaram is linked to the Indian mainland by the Pamban Bridge.

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