You have one of those pesky integrated intel graphics cards. I hate them. Try updating your graphics drivers before we look into anything else.
If that does not work heres an experiment:
-go to kenshi\data\land\textures\
-take Sand01bc.dds and Sand01bc_n.dds and move them to the desktop, or somewhere away from the game folder
-make a copy of Cliffs01.dds and Cliffs01_n.dds
-rename the copies to Sand01bc.dds and Sand01bc_n.dds respectively.
-see what happens
I have one of those Nvidea Optimus hybrid thingies. The other card is a GeForce 555M, I have tried to force both Kenshi.exe and _Core.exe to run on the GeForce card, seems that it refuse to do so if it is not in the log? I can try to disable the integrated card completely, and see what happens.
(all drivers are updated, by the way, first port of call...)
I have tried to change the textures, as suggested, but to very little effect. The ground close to the camera is still black, and the one far away also, but now with a strange texture smudge on it.