The ocean that lies between Africa and Australia is the Indian Ocean. This ocean is the third-largest of the world's five oceans and covers about 20% of Earth's water surface. It is bordered by several countries, including India, Indonesia, and Yemen, and is known for its warm waters and rich biodiversity. The Indian Ocean plays a significant role in global trade and transportation, as it serves as a major shipping route. Additionally, this ocean is home to various ecosystems, including coral reefs, and is vital for the livelihoods of many coastal communities.