Overview
The Indian Ocean is the third-largest of Earth's oceans, covering approximately 70 million square kilometers, about 20 percent of the water on Earth's surface. It is bounded by Africa to the west, Asia to the north, Australia to the east, and the Southern Ocean to the south. It is the only ocean named after a country.
Geography and Physical Features
The Indian Ocean has an average depth of about 3,890 meters, with its deepest point in the Java Trench reaching roughly 7,290 meters. Major seas and gulfs include the Arabian Sea, Bay of Bengal, Red Sea, and Persian Gulf. The ocean's circulation is uniquely influenced by the seasonal monsoon system, which reverses winds and currents twice a year.
Significance
The Indian Ocean has been a hub of trade and cultural exchange for thousands of years, connecting East Africa, Arabia, India, Southeast Asia, and China. The monsoon trade routes linked civilizations from at least the first century AD and carried spices, textiles, and ideas across vast distances. Today it carries much of the world's oil shipments.
Notable Facts
The Indian Ocean is the warmest of the world's oceans, with surface temperatures in some regions exceeding 28 degrees Celsius year-round. The 2004 Indian Ocean tsunami, triggered by a massive undersea earthquake, was one of the deadliest natural disasters in history. The Maldives, an archipelago in the ocean, is the world's lowest-lying country.