First possibly-reliable source I found (I had read about this before, but don&#x27;t remember where)<p>Some text: <a href="http:&#x2F;&#x2F;earthobservatory.nasa.gov&#x2F;Features&#x2F;Maya&#x2F;" rel="nofollow">http:&#x2F;&#x2F;earthobservatory.nasa.gov&#x2F;Features&#x2F;Maya&#x2F;</a><p>and some maps speculating about the extend and climate change: <a href="http:&#x2F;&#x2F;earthobservatory.nasa.gov&#x2F;IOTD&#x2F;view.php?id=77060" rel="nofollow">http:&#x2F;&#x2F;earthobservatory.nasa.gov&#x2F;IOTD&#x2F;view.php?id=77060</a>