You can tell by the name.
Example: The map's name is FlameForest
Once you exported and/or saved it, the contents of it would be in the FeralHeart>> Media>> Terrains folder. If You exported it as FlameForest, It'll make a .map file, called FlameForest.map
It'll also create a folder called FlameForest, with everything in it. It'll also just have the Hight map and Terrain masks in there. Just delete all of those. If you need more help, tell me.