June 10, 2013, 01:48:00 pm
Lumion supports a world size of 43 km from center.
However, there are technicalities about floating point calcs for real-time to render distance objects, that really means you should only consider world sizes up to about 25 to 30km.
The 2km (2048m) limit is the area for the editable Lumion terrain. You can use that terrain, or create and import your own, as needs require, that can extend beyond that.
The new version (3.2.0) of Lumion supports a teleporting feature that you might find useful with large areas up to 15km

There are some great samples from users of large scene renders. It's also got the best water and ocean feature that for real-time is tops (performance and quality) (but of course I would say that

(but it's so

)