The term 'Island on the Java Sea' refers to two islands located in Indonesia, Borneo and BALI. Borneo is the third largest island in the world and is located in the Malay Archipelago. It is divided between the countries of Brunei, Indonesia, and Malaysia. BALI is an Indonesian island located east of Java and west of Lombok. It is known for its volcanic mountains, beaches, and coral reefs. Both islands are popular tourist destinations.