did you mean Archipelago? an Archipelago is a chain or cluster of islands that is formed tectonically
That would happen to be Indonesia. •The largest archipelago in the world, consist of 17,000 islands and islets •Total land area 1,91 kilometers square and 547,116 kilometers of coastline •The population in 2000 is about 203 million (2000 census) •Administratively is divided into 30 provinces, 2 special region •Nearly 60 percent of Indonesia's land is forested and also mountainous and volcanic