(2) Indonesia Explanation: An archipelago, sometimes called an island group or island chain, is a chain or cluster of islands. Archipelagos may be found isolated in bodies of water or neighboring a large land mass. Indonesia is the world’s largest archipelago with over 13,000 islands & totals around 18,000 islands. The Malay Archipelago (or Indonesian Archipelago) is often referred to as the largest archipelago in the world, but this is meant by area rather than number of islands. This title aptly represents its 25,000 - 30,000 or so islands which span 5,400 kilometres eastward from Sabang in northern Sumatra to Merauke in Irian Jaya (now known as Papua).