Indomalaya: The Biodiversity Hotspot Spanning South and Southeast Asia

Stretching from the Himalayan foothills to the Indonesian archipelago, the Indomalayan realm is one of Earth's eight biogeographic realms — and among its most species-rich. This vast ecozone covers 7.5 million km² across 18 countries, harboring iconic megafauna and countless endemic species found nowhere else.

Geographic Boundaries

North: The Himalayas form a sharp barrier from the Palearctic realm. South: The Indian Ocean. East: The Pacific Ocean and Wallace's Line (the deep-water boundary separating Asian from Australasian fauna). West: The Palearctic realm across the Hindu Kush and Iranian Plateau.

Countries Within Indomalaya

South Asia: India, Pakistan, Nepal, Bhutan, Bangladesh, Sri Lanka
Southeast Asia: Myanmar, Thailand, Laos, Cambodia, Vietnam, Malaysia, Singapore, Indonesia, Brunei, Philippines, East Timor
East Asia outliers: Southern China (Yunnan, Guangdong, Hainan), Taiwan

Biodiversity Crown Jewels

• Tiger subspecies (Bengal, Indochinese, Malayan, Sumatran)
• Asian elephant strongholds
• Orangutans (Bornean, Sumatran, Tapanuli)
• Rhinoceroses (Indian, Javan, Sumatran)
• Bird diversity: 1,300+ species including hornbills, pittas, broadbills
• Plant endemism: Rafflesia (world's largest flower), dipterocarp rainforest dominants

Threats and Conservation

Palm oil, logging, agriculture, and wildlife trade have reduced original forest cover by ~50%. Protected areas like Gunung Leuser (Sumatra), Chitwan (Nepal), and Taman Negara (Malaysia) are critical refuges. The realm's future hinges on balancing 2 billion humans' needs with its irreplaceable biology.

Indomalaya isn't just a map label — it's a evolutionary laboratory where isolation, monsoons, and deep time forged life forms that exist nowhere else on Earth.