Strange shadow artifacts

I'm having this hyper-strange issue with my shadows.

The effect takes place with any form of shadow but is the least visible with the directional light.

You can see the effect Here.

Up close the artifacts are of varied shape and size, primarily triangles and some squares. Unfortunately I can't get a screenshot up close because the shadows disappear when up close.

I'm using Unity 5.3.4 Pro.

Anyone have any thoughts or ideas?

UPDATE: it was static generated by terrain composer. Issue was fixed by just packing all of the terrains and stones and such into a prefab and creating a new scene. Closing.