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. The Palk Strait isolates India from Sri Lanka. It is surrounded on the south by Pamban Island (India), Adam’s (Rama’s) Bridge (a chain of shoals), the Gulf of Mannar, and Mannar Island (Sri Lanka). The southwestern division of the strait is also called Palk Bay. The strait is 40 to 85 miles (64 to 137 km) wide, 85 miles long, and less than 330 feet (100 metres) deep. It holds several rivers, including the Vaigai (India), and it contains many islands on the Sri Lankan side.