Indian Ocean

Lore & Background

The Indian Ocean has been known by its present name since at least 1515, when the Latin form Oceanus Orientalis Indicus (lit. 'Indian Eastern Ocean') is attested, named after India, which projects into it. It was earlier known as the Eastern Ocean, a term still in use during the mid-18th century, as opposed to the Western Ocean (Atlantic) before the Pacific was surmised. The modern Hindi name is हिंद महासागर (Hind Mahāsāgar; lit. 'Ocean of India'). Conversely, Chinese explorers (e.g., Zheng He during the Ming dynasty) who traveled to the Indian Ocean during the 15th century called it the Western Oceans. In Ancient Greek geography, the Indian Ocean region known to the Greeks was called the Erythraean Sea. In traditional Indian geography, the ocean is historically called the Mahodadhi (Sanskrit: महोदधि, lit. 'ocean, big sea'), divided into the two seas Purvapayodhi (Sanskrit: पूर्वपयोधि, lit. 'sunrise', referring to the Bay of Bengal) and Apara (Sanskrit: अपर, lit. 'sunset', referring to the Arabian Sea). Another name used is Ratnakara (Sanskrit: रत्नाकर, lit. 'one having jewels, mine of jewels, repository of jewels').

Reader's Guide

The Indian Ocean is ecologically diverse, with important ecosystems such as coral reefs, mangroves, and seagrass beds. It hosts a significant portion of the world's tuna catch and is home to endangered marine species. The climate around the Indian Ocean is characterized by monsoons. Its waters are affected by the Indian Ocean Walker circulation, resulting in unique oceanic currents and upwelling patterns. The Indian Ocean has been a hub of cultural and commercial exchange since ancient times. It played a key role in early human migrations and the spread of civilizations. In modern times, it remains crucial for global trade, especially in oil and hydrocarbons. Environmental and geopolitical concerns in the region include climate change, overfishing, pollution, piracy, and disputes over island territories. More than two billion people live in countries bordering the Indian Ocean. The Indian Ocean drainage basin covers 21,100,000 km² (8,100,000 sq mi), similar to that of the Pacific Ocean and half that of the Atlantic basin, or 30% of its ocean surface. The largest rivers are the Zambezi, Ganges-Brahmaputra, Indus, Jubba, and Murray rivers. After the breakup of East Gondwana and the formation of the Himalayas, the Ganges-Brahmaputra rivers flow into the world's largest delta known as the Bengal delta or Sunderbans.

Did You Know?

• The Indian Ocean is the youngest of the oceans, directly preceded by the Tethys Ocean, which fragmented into the Mediterranean Sea and the Indian Ocean only 20 million years ago.
• It is the warmest ocean, with a significant impact on global climate due to its interaction with the atmosphere.
• The Indian Ocean has been known by its present name since at least 1515, when the Latin form Oceanus Orientalis Indicus is attested.
• In Ancient Greek geography, the Indian Ocean region known to the Greeks was called the Erythraean Sea.
• The Ganges-Brahmaputra rivers flow into the world's largest delta known as the Bengal delta or Sunderbans.