well it is because an archipelago means, "small islands". Philippines has small islands. Spaniards began to call it as archipelago.
You call it archipelago.
An "archipelago".
It's called an archipelago.
Yes, the Hawaiian Islands are properly called an Archipelago.
A chain or cluster of islands is called an archipelago.
archipelago
it is called archipelago
Geographers call an island chain an Archipelago.
archipelago
It is called an archipelago.
A group of islands is called an archipelago.
A collection of islands is called an archipelago.