It is archipelago.
A large group of islands clustered together is known as an archipelago. Some of most popular archipelagos in the world include Severnaya Zemlya, Svalbard, Antilles and many more.
The group could be called an archipelago. An extended line (e.g. from volcanoes) would be an island chain.
An 'archipelago' means 'a large group of islands'
Japan is a large island with many little islands around it.
What is a cape
noun, plural ar·chi·pel·a·gos, ar·chi·pel·a·goes. a large group or chain of islands: the Malay Archipelago. any large body of water with many islands. the Archipelago, the Aegean Sea.The collective noun for islands can be a sting of islands, a chain of islands, a cluster of islands, or a group of islands.
Because they form a large group or chain of islands
Archipelago
A large group of islands is called an archipelago.
The large group of islands in the South Pacific is known as Oceania. These islands are classified as either the high islands or the low islands.
I'm not sure what you mean by that but a group of islands is referred to as an archipelago.
A large number of people together is called a crowd or a group.