WordReference Random House Unabridged Dictionary of American English © 2026
Wal′lace's line′, [Zoogeog.]
  1. an imaginary line that separates the Oriental and Australian zoogeographical regions and passes between Bali and Lombok, west of Celebes, and east of the Philippines.
  • after A. R. Wallace 1865–70

Collins Concise English Dictionary © HarperCollins Publishers::
Wallace's line n
  1. the hypothetical boundary between the Oriental and Australasian zoogeographical regions, which runs between the Indonesian islands of Bali and Lombok, through the Macassar Strait, and SE of the Philippines
Etymology: 20th Century: named after Alfred Russel Wallace

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