Archipelago

n.	1.
	1.	The Grecian Archipelago, or Ægean Sea, separating Greece from Asia Minor. It is studded with a vast number of small islands.
	2.	Hence: Any sea or broad sheet of water interspersed with many islands or with a group of islands.

Noun

1.

archipelago - a group of many islands in a large body of water

ait, atoll, bar, cay, continental island, coral head, coral island, coral reef, holm, insularity, island, island group, islandology, isle, islet, key, oceanic island, reef, sandbank, sandbar