wierd rendering bug, with massive terrain

Ok, so I have a big project, MMORPG! but I need a BIG terrain, this has been achievable but there are some rendering issues and are attached to this *question. This only happens at a 20 - 30 degree angle, also I have figured out it is from shadows and with some messing around I can confirm it is hard shadows. see how there is black circles? there is one for each cascade.47635-problem.png

most things have this rendering issue, is there a option on the camera to fix?
thanks
-Cow Necromancer

The only thing i can think of right now that happened to me similar to this is the Pixel Light Count. Check in Edit > Project Settings > Quality

and change the Pixel Light Count to a higher number and see if that helps.