Geographers call an island chain an Archipelago.
archipelago
Geographers refer to a long chain of islands like Japan as an archipelago.
it is called archipelago
The name for a cluster or chain of islands is "archipelago". (More technically, it would apply to a chain of islands like Hawaii, which are all formed from the same tectonic / volcanic source.)
Oceania.
eqyator
metropolitan areas
The continental islands, Oceanic islands, and the Atolls.
island chain
An island chain is called an archipelago. It is a group or chain of islands clustered together in a body of water, such as the ocean.
They call it physical features.
Greenwich mean time [gmt]