How did Coruscant acquire oceans?
The same way it acquired mountains–a novelist took us somewhere we hadn’t been before. The geography of the whole of Coruscant has never been definitively laid out–just a few word sketches here and there, and the illos in the comics. I would (and did, to Lucasfilm) argue that a city covering all of a planet’s surface area is as unlikely to be ecologically viable as a planet with no large bodies of water. You’ve got to have a water cycle, you’ve got to have a carbon/oxygen cycle, you’ve got to have seas to moderate the extremes of temperature. Coruscant is supposed to be (have been) a wonderful place to live–it’s not Mars or Ganymede covered with city, but something much more earthlike. Economics also argue against the “Trantor”-type planetary city. The sheer volume of food and other consumables, raw materials, and manufactured goods required by an enormous urban population would turn the skies black with space freighters. So consider the image of Coruscant as a planet-sized city a b
