Archipelago

The Indonesian Archipelago, located in Asia and Oceania, is the largest archipelagic state in the world.
The Aegean Sea with its large number of islands is the origin of the term archipelago.
The Mergui Archipelago in Myanmar

An archipelago (/ˌɑːrkəˈpɛləɡoʊ/ ⓘ AR-kə-PEL-ə-goh), sometimes called an island group or island chain, is a chain, cluster, or collection of islands. An archipelago may be in an ocean, a sea, or a smaller body of water. The largest archipelago country in the world is Indonesia, whose territory comprises most of the Indonesian Archipelago. Examples of archipelagos include the Aegean Islands (the origin of the term archipelago), the Canadian Arctic Archipelago, the Stockholm Archipelago, the Lucayan (Bahamian) Archipelago, the Japanese archipelago, the Hawaiian Archipelago, and the Galapagos.