The ocean known for having the most islands is the Pacific Ocean. This vast body of water is the largest and deepest ocean on Earth, extending from the Arctic in the north to the Southern Ocean in the south. It has thousands of islands scattered across its expanse, including major archipelagos such as Hawaii and the Philippines. The Pacific is known for its diverse ecosystems and cultures, resulting from its numerous island chains and coastal regions. Its islands range from large landmasses like New Guinea to tiny, uninhabited atolls, all contributing to the ocean's rich biodiversity.