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World Rainforests
THE WALLACE LINE
The Wallace Line more or less marks the edge of the Asian continental
shelf: the shaded regions mark the areas that were exposed during recent ice ages resulting from the drop in global
ocean levels. It is evident that two major land masses existed in the Australian-Southeast Asian zone. Each of
these is now considered its own biogeographical realm. The islands in the middle, notably Sulawesi, were isolated
and therefore independent of the two zones and subsequently have species characteristic of neither realm. |
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