This is a world map builder with interlocking peices that can be used for an RPG map or just for fun. It is an upgraded version of my town map builder: http://www.thingiverse.com/thing:2278592.
Each square is two inches wide and long.

The expansions are here :
https://www.thingiverse.com/thing:2354538 Dead Lands
https://www.thingiverse.com/thing:2359639 Lost Jungle
https://www.thingiverse.com/thing:2359970 Lands Edge
https://www.thingiverse.com/thing:2361395 Oceanic Acropolis
https://www.thingiverse.com/thing:2364428 Farmers Plight
https://www.thingiverse.com/thing:2369608 Traveled Roads
https://www.thingiverse.com/thing:2372060 Merchant Heights
https://www.thingiverse.com/thing:2398764 Over Seas
https://www.thingiverse.com/thing:2399271 Army Encampment

or see them all here: https://www.thingiverse.com/OfAMillionProblems/collections/world-map-builder

If you have an idea for an expansion don't hesitate to put it in the comments.