What countries make up the 'First Island Chain'?

• A. Japan, Taiwan, the Philippines, and parts of Southeast Asia.
• B. United States, Canada, Mexico, and Greenland.
• C. India, Pakistan, Bangladesh, Sri Lanka.
• D. Russia, Mongolia, Korea, Kazakhstan.

Answer: (A)

The First Island Chain is a maritime perimeter in the Western Pacific, defined by a line of islands and archipelagos that runs from Japan through Taiwan to the Philippines and into parts of Southeast Asia. It’s a framework used in strategic studies to talk about naval access, deterrence, and how powers project air and sea power in East Asia.

This is why the correct option fits best: it lists Japan, Taiwan, the Philippines, and parts of Southeast Asia. Those locations collectively form the widely described chain, underscoring that the concept is about a stretch of islands across several countries, not a single nation. The inclusion of “parts of Southeast Asia” reflects the Indonesian, Malay Peninsula, and broader archipelagic areas that boundary the western Pacific.

Other options pull in regions unrelated to this maritime perimeter (North America, the Indian subcontinent, or continental Eurasia), so they don’t describe the First Island Chain. In short, the chain captures the eastern edge of Asia’s maritime domain, a key lens in discussions about regional security and power projection.