The easiest and quickest way of texturing terrain is using tpaint and some of these textures from this site: http://www.cgtextures.com/index.php

I have a problem, I've made overgrowth of my map and probably because I painted partially the surrounding terrain by painting near edges of my map, one of my poles of surrounding area became hilly (really pointed hills). And while launching my map the game crashes at 15%, so I suppose that could be the reason. I think that one of the solutions would be copying the terrain of this pole from backup map. Tell me only, what is the name of this file?