Barren Island, India's only confirmed active volcano, is situated in the:

Barren Island lies in the Andaman Sea, about 135 km north-east of Sri Vijaya Puram (Port Blair), the capital of the Andaman and Nicobar Islands. It is the only confirmed active volcano in India and in South Asia.

About Barren Island:

• It is a small island, about 3 km across, with an area of about 8 square km.
• It is uninhabited, except for a few goats and other animals, and is part of the Andaman and Nicobar Islands Union Territory.
• The volcano rises from the sea floor at a depth of about 2,250 metres; only the top part, about 350 metres high, is above sea level.

Volcanic activity:

• Its first recorded eruption was in 1787.
• After a long period of quiet, it became active again in 1991, and has erupted many times since, including in 2017 and later years, with ash plumes and lava flows.

Why there is a volcano here:

• The Andaman and Nicobar Islands lie along a zone where the Indian Plate moves beneath the Burma microplate (part of the Eurasian Plate).
• As the plate sinks into the mantle, it melts, and the magma rises to form volcanoes.
• This volcanic arc continues southward into Indonesia, which has many active volcanoes.

Narcondam Island:

• Narcondam Island, also in the Andaman Sea, about 140 km north of Barren Island, is a dormant volcano.
• It is the only home of the Narcondam hornbill, an endangered bird found nowhere else.

About the Andaman Sea:

• It lies to the east of the Andaman and Nicobar Islands, bordered by Myanmar and Thailand on the east and Indonesia's Sumatra to the south.
• It is connected to the Bay of Bengal and leads to the Strait of Malacca.

Why not the other options?

• ✗The Arabian Sea and the Lakshadweep Sea lie to the west of India.
• ✗The Gulf of Mannar lies between India and Sri Lanka.