Wallaces' Line is a biological dividing line passing north-north-east between the East Indian islands of Bali and Lombok and Borneo and Celebes, to the west of which the flora and fauna are distinctly Asian in character, while to the east and south the Australian elements begin to be marked, and very soon become predominant. It was named after the biologist Wallace who clearly defines it in his book 'Island Life' published in 1880. Research Wallace's Line
 
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