Andaman and Nicobar Islands:
The Andaman and Nicobar Islands is a union territory of India consisting of 572 islands stretched in the Bay of Bengal and the Andaman Sea.
The total land area of the islands is approximately 8,249 km2.
Lakshadweep Islands:
Lakshadweep is a union territory of India consisting of 36 islands in the Arabian sea, located 200 to 440 km off the Malabar Coast.
The name Lakshadweep means “one lakh islands”.
The lagoon area covers about 4,200 km2, the territorial waters area 20,000 km2, and the exclusive economic zone area 400,000 km2.
Final Answer:
The two major island groups in India are the Andaman and Nicobar Islands stretched in the Bay of Bengal and Lakshadweep Islands in the Arabian Sea.