Shallow shelf of land in southeast Asia, now at least 100 m deep under the sea, but exposed during the Pleistocene when more sea water was bound up in continental glaciers; the Sahul shelf would have united New Guinea with the Australian continent.
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land bridge (Floor of a shallow sea between continents that is exposed when sea levels fall, typically during ...)
Wallacea (... continents of the Sunda shelf and the Sahul shelf.)