Why it matters
A plain larger than India joined Borneo, Sumatra and Java, then vanished under the sea — a prime address for a lost lowland. Proposed, not proven.
What mainstream says
The exposure is certain geology; a developed population there is the hypothesis.
Graded Proposed · P on the Ancient Code honesty scale (A grounded · C contested · S speculation · U unidentified). It belongs to the Drowned worlds line of evidence.
Sources & further reading
The authoritative reference for this site/finding — and its own primary citations — so you can check us.