Lake Vast, Traid, Cassidine

I'd like to explore what is published (cannon and fan) about Lake Vast the city and the lake on Triad.<br /><br />If nothing is out there I am inclined to think of Lake Vast as a giant lake high up on an equatorial continental plateau where the opposite shore cannot be seen.  Lake Vast the city is on one of it's shores and is the location of the world starport because it affords both equatorial assist to orbit and safe weather emergency water landings.  The lake is likely formed by tectonic activity and not glacial or volcanic activity.  Essentially as the plateau was uplifted by seismic events the land under the lake was not uplifted.  I picture a series of waterfalls allowing the lake to drain to the coastal zones on one corner with a long series of rivers and green jungle below it.<br /><br />I picture the lake as large as all the great lakes combined.