Step 1: Conceptualization:
Identify the geographical feature (strait) separating India's Andaman Islands from Myanmar's islands.
Step 2: Elaboration:
The Andaman and Nicobar Islands form an archipelago in the Bay of Bengal. North Andaman Island is the northernmost Andaman group. North of it are the Coco Islands, belonging to Myanmar. The narrow, strategic waterway between India's North Andaman Island and Myanmar's Coco Islands is the Coco Strait, also called Coco Channel.
Step 3: Conclusion:
The Coco Strait separates the North Andaman islands from Myanmar's islands.