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6. Sumatra

Location: Indonesia, Asia

Area: 171,069 sq miles

Population: 50,000,000

Population Density: 275/sq miles

The Indonesian island of Sumatra, which straddles the equator, steals the number six spot. The enormous island’s jungles are teeming with rare and critically endangered wildlife, including the Sumatran rhino, the Sumatran tiger, the Sumatran orangutan, and the Sumatran ground cuckoo. Indonesia’s largest island is also home to one of the world’s largest and worst smelling flowers, Rafflesia arnoldii, otherwise known as the “stinking corpse lily.”

Sumatra WhitcombeRD / Getty Images

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