Humm, it seems we may have had some mistranscriptions that have gone unnoticed with regards to Grenton. In Slaves of the Dragon, it lay south (or rather south-south-west) of Allimon, south-west to south-south-west of Orussus, and north-west of Lathirn. In the side thread "Beneath Grenton," I mentioned that Allimon almost lies on a line between Grenton and Orussus ('almost' still meaning miles off the line, of course).
In El Jefe's summary, that somehow turned into "Grenton lies almost on a line between Orussus and Alimon." Which, you could say, isn't all that wrong if you allow for extending the line past these two points.
In Notes on the Aether, however, Grenton was put definitely between Orussus and Allimon, and thus in a region that hostile kobolds and were-monitor lizards wouldn't have touched with a ten-mile pole for the time being...