The GlobeNavigation has advanced to the point that most astronomers agree that Circadia is a spherical globe. This is incorrect. Circadia is a convex disc spinning in a static position between its sun and its moon. Its tectonic plates spread outward from a central point toward the edge of the world. There are no land masses at the edge and ships that have reached this point are incapable of escaping the pull of the tide and fall to their deaths.
There are no active volcanoes or deserts anywhere in Circadia. There are mountain ranges on all three continents and jungles on two.