Which of the following have coral reefs? 1. Andaman and Nicobar Islands 2. Gulf of Kachchh 3. Gulf of Mannar 4. Sunderbans. Select the correct answer using the code given below.

1. Andaman and Nicobar Islands — India’s major fringing and patch coral reefs are found here. Correct.

2. Gulf of Kachchh — This gulf on the Gujarat coast has well-known coral reefs, mainly fringing/patch types. Correct.

3. Gulf of Mannar — It is one of India’s important coral reef regions, associated with many islands between India and Sri Lanka. Correct.

4. Sunderbans — The Sundarbans are a mangrove-dominated deltaic ecosystem, not a coral reef region. Incorrect.

Hence, 1, 2 and 3 only are correct.