Wallace's Line

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Wallace's Line

the division between the BIOGEOGRAPHICAL REGIONS of Australia and the Orient. The line lies between Lombok and Bali, the Celebes and Borneo, and east of the Philippines.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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The main bulk of the Philippines lies to the east, but Palawan, lies to the west of the Wallace Line. The country's westernmost extremity was probably linked to Borneo during the last Ice Age, and therefore has a fauna and flora similar to Southeast Asia's and quite different from anything else found in the Philippines.