Unexpected Terrain Lighting Results

Troubleshooting effects
1

I’m not 100% sure if this is suppesed to happen, but I want to change it, when I use the terrain lighting with a directional light, I get the following result: http://imgur.com/AK3dU I’m specifically talking about the weird ‘Ink Blotches’ or splotches where the terrian is pure black, if these are the shadows, I don’t wan’t them to be 100% black, I wan’t them to be darker, but not black. How do you fix this? Like I stated above, I’m using a directional light, do I need to use a different light source?