You likely mean either the Aleutian Islands or Alexander Archipelago.
Because they form a large group or chain of islands
The Aleutian Islands form the longest archipelago in the U.S. state of Alaska. This chain of islands extends about 1,200 miles (1,900 km) from the Alaska Peninsula to the Kamchatka Peninsula in Russia.
Archipelago is a group or chain of islands.
An archipelago is a group of islands. In some cases archipelagos form a country. An example of this is Japan. It is a group of islands that form a country.
It is known as an archipelago.
Bahrain is a group of islands in the Persian Gulf that form the smallest of the Gulf States. It is an archipelago made up of 33 islands, with Bahrain Island being the largest and most populous.
The Aleutians Islands form part of Alaska.
The Aleutian Islands. They stretch over 1200 miles from the Alaska Peninsula to the Kamchatka Peninsula, across the Bering Sea. The two westernmost islands in the chain (Medny Island and Bering Island) are part of Russia.
the four balearic islands are Menorca Mallorca fuerteventura and Ibiza
The Isles of Scilly form the southernmost part of Britain. This archipelago is located off the southwestern tip of Cornwall in England.
Here is your answer.http://en.wikipedia.org/wiki/Archipelago
The Chatham Islands are located in the Pacific Ocean south of the country of New Zealand. The Chatham Islands are composed of 10 islands and form an archipelago.