Explanation:

•  (a) The Gulf of Mannar is a large shallow bay forming part of the Laccadive Sea in the Indian Ocean.
• It lies between the southeastern tip of India and the west coast of Sri Lanka, in the Coromandel Coast region.
• (b) 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 the Palk Bay in the southwest.
• (c) Kanyakumari is a coastal town in the state of Tamil Nadu on India's southern tip.
• Jutting into the Laccadive Sea, the town was known as Cape Comorin during British rule and is popular for watching sunrise and sunset over the ocean.
• It's also a noted pilgrimage site.
• (d) Adam's Bridge, also known as Rama's Bridge or Rama Setu, is a chain of limestone shoals, between Pamban Island, also known as Rameswaram Island, off the south-eastern coast of Tamil Nadu and Mannar Island, off the north-western coast of Sri Lanka.