What is the most populous island?

The most populous island in the world is Java, located in Indonesia. It has a population of over 145 million people, making it the most densely populated island in the world. Java is also the most populous island in the Southern Hemisphere. The island is home to the capital of Indonesia, Jakarta, which is also the most populous city in the country. Java is known for its rich cultural heritage, stunning beaches, lush rainforests, and some of the most active volcanoes in the world.