Indian Ocean - geography.

Indian Ocean - geography. Indian Ocean, third largest of Earth's five oceans, bounded on the west by Africa, on the north by Asia, on the east by Australia and the Australasian islands, and on the south by the Southern Ocean. No natural boundary separates the Indian Ocean from the Atlantic Ocean, but a line 4,000 km (2,500 mi) long on the 20th meridian east of Greenwich, connecting Cape Agulhas at the southern end of Africa with Antarctica, is ge...