# Adding new locations, then a totally new world

**URL:** <https://discourse.cataclysmdda.org/t/adding-new-locations-then-a-totally-new-world/11637>\
**Category:** The Lab\
**Created:** [March 31, 2016, 10:29pm UTC](https://discourse.cataclysmdda.org/t/adding-new-locations-then-a-totally-new-world/11637 "2016-03-31T22:29:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Cagone](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/cagone/32/543_2.png) [@Cagone](https://discourse.cataclysmdda.org/u/Cagone)\
**Post date:** [March 31, 2016, 10:29pm UTC](https://discourse.cataclysmdda.org/t/adding-new-locations-then-a-totally-new-world/11637/1 "2016-03-31T22:29:34Z")

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My idea is to make a lot of alternative overmap tiles, test them on the normal world and when I have made enough use them to build a new world quite different from that stale New England setting.

First of all, how can I make a new overmap tile? I can put a “mapgen” folder in my mod, make a .json with the map of the new location, but I do not know how to integrate it in the newly generated map and how to test it. AFAIK I should make a new overmap\_terrain.json in my mod folder, add the data for my tile, then generate a new world. Right? So, what’s the difference between overmap\_terrain and overmap\_specials?