Currently, most systems are designed with the previously-named "Insane" map size as the absolute maximum (8 × 8 tiles) for the playable area. Anything larger than this may not function as expected. For example, objects and resources cannot be placed beyond those dimensions.
It is recommended to remove any tiles outside of a 10 × 10 area (with these additional tiles only being used for the out-of-bounds space beyond the map's borders).