I think I've seen you mention SmartMap in another post, is that the map script in question (which options? I think it has quite a few ...)? How did you get it to place the new terrain? The latitude limits should be set in some generateTerrainAtPlot function either in the map script or in CvMapGeneratorUtil.py. SmartMap also seems to be bundled (always?) with MapScriptTools.py, which has a function getLatitudeBorders that might play a role.