third island chain

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun politics, India The Andaman Islands, Nicobar Islands, Sumatra; from Burma in the north to either the Indonesian Archipelago, or Australia in the south.
• proper noun politics, US The Aleutian Islands, Emperor Seamounts, Hawaiian Islands, Line Islands, New Zealand; from Alaska to New Zealand or Tasmania and Australia.