Palk Strait in the context of "Vaigai river"

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, formerly known as Ceylon, is an island country in South Asia. It is located in the Indian Ocean, southwest of the Bay of Bengal, and is separated from India by the Gulf of Mannar and the Palk Strait. It shares a maritime border with the Maldives in the southwest and India in the northwest, and it lies across the Bay of Bengal from Bangladesh and Myanmar in the northeast and the Andaman and Nicobar Islands in the east. Sri Jayawardenepura Kotte is the legislative capital of Sri Lanka, while the largest city, Colombo, is the administrative and judicial capital which is the nation's political, financial and cultural centre. Kandy is the second-largest city and also the capital of the last native kingdom of Sri Lanka. The majority of the population speak Sinhala, while Tamil is the second most-spoken language. They are spoken by approximately 17 million and 5 million people respectively.

Sri Lanka has a population of approximately 22 million and is home to several cultures, languages and ethnicities. The Sinhalese people form the majority of the population, followed by the Sri Lankan Tamils, who are the largest minority group and are concentrated in the north of the island; both groups have played a major role in the island's history. Other long-established groups include the Moors, Indian Tamils, Burghers, Malays, Chinese, and Vedda.

Tamil Nadu is the southernmost state of India. The tenth largest Indian state by area and the sixth largest by population, Tamil Nadu is the home of the Tamil people, who speak the Tamil language—the state's official language and the first to be recognised as a classical language in India. The capital and largest city is Chennai.

Located on the south-eastern coast of the Indian peninsula, Tamil Nadu is straddled by the Western Ghats and Deccan Plateau in the west, the Eastern Ghats in the north, the Eastern Coastal Plains lining the Bay of Bengal in the east, the Gulf of Mannar and the Palk Strait to the south-east, the Laccadive Sea at the southern cape of the peninsula, with the river Kaveri bisecting the state. Politically, Tamil Nadu is bound by the Indian states of Kerala, Karnataka, and Andhra Pradesh, and encloses a part of the union territory of Puducherry. It shares an international maritime border with the Northern Province of Sri Lanka at Pamban Island.

Ramanathapuram district, also known as Ramnad district, is one of the 38 administrative districts of Tamil Nadu state in southern India. The old Ramanathapuram District consists of present-day Virudhunagar and Sivagangai districts, it touches the Western Ghats and bordered with the state of Kerala and east by Bay of Bengal. It was the largest district on that time. The town of Ramanathapuram is the district headquarters. Ramanthapuram District has an area of 4,123 km. It is bounded on the north by Sivaganga District, on the northeast by Pudukkottai District, on the east by the Palk Strait, on the south by the Gulf of Mannar, on the west by Thoothukudi District, and on the northwest by Virudhunagar District. The district contains the Pamban Bridge, an east–west chain of low islands and shallow reefs that extend between India and the island nation of Sri Lanka, and separate the Palk Strait from the Gulf of Mannar. The Palk Strait is navigable only by shallow-draft vessels. As of 2011, Ramanathapuram district had a population of 1,353,445 with a sex-ratio of 983 females for every 1,000 males. The district is home to the pilgrimage centre of Rameswaram and tourist spot Dhanushkodi, an abandoned town.

Pudukkottai district is one of the 38 districts of Tamil Nadu state in southern India. The city of Pudukkottai is the district headquarters. It is also known colloquially as Pudhugai. The city is also known as Thondaiman Pudukkottai.

Pudukkottai district is bounded on the northeast and east by Thanjavur District, on the southeast by the Palk Strait, on the southwest by Ramanathapuram and Sivaganga districts, and on the west and northwest by Tiruchirapalli District. As of 2011, the district had a population of 1,618,345 with a sex-ratio of 1,015 females for every 1,000 males.

Adam's Bridge, also known as Rama's Bridge or Rama Setu, is a chain of natural limestone shoals between Pamban Island, also known as Rameswaram Island, off the southeastern coast of Tamil Nadu, India, and Mannar Island, off the northwestern coast of Sri Lanka. Geological evidence suggests that the bridge was formerly a land connection between India and Sri Lanka.

The feature is 48 km (30 mi) long and separates the Gulf of Mannar (southwest) from the Palk Strait (northeast). Some regions of the bridge are dry, and the sea in the area rarely exceeds 1 metre (3 ft) in depth, making it quite difficult for boats to pass over it.

Palk Bay is a semi-enclosed shallow water body between the southeast coast of India and Sri Lanka, with a water depth maximum of 13 m. Palk Bay is located between 8° 50′ and 10° North latitudes and 78° 50′ and 80° 30′ East longitudes. The width of the bay ranges from 57 to 107 km and the length is around 150 km. It is one of the major sinks for sediments along with the Gulf of Mannar. Sediments discharged by rivers and transported by the surf currents as littoral drift settle in this sink. Few scientists have tried to understand the wave characteristics within the Palk Bay.

In the southern regions close to Dhanushkodi, wind seas dominate. The north-eastern region of Palk Bay is exposed to the Bay of Bengal through the shallow Palk Strait allowing swells to enter. To the south, Adam's Bridge separates Palk Bay from the Gulf of Mannar. Despite being a very shallow channel, wave effects are transmitted to a small extent through the Adam's Bridge passage. It is interesting to notice that, despite the visible block along the Adam's Bridge, the passage of wind wave and ocean current (to a very small extent) from the Gulf of Mannar to the bay is evident. Meanwhile, even with a wider and broader opening along the north-eastern borders of the bay, facing the Bay of Bengal, the wind wave and ocean current fluxes are less significant here.