There are 5 main islands in Indonesia are (Irian), (Java), (Kalimantan), (Sulawesi) and (Sumatra) Java is the smallest island among the islands of Ko 5.
Indonesia is an archipelago 5 main islands (Irian), (Java), (Kalimantan), (Sulawesi) and (Sumatra) island of Java is the smallest island in the islands of the 5 islands.