I was able to solve the issue by Enabling the NaniteSkirt and setting the NaniteSkirtDepth to a valve of 0.0 (the default is 0.1). While enabling NaniteSkirt made a small difference, setting the SkirtDepth to 0.0 is what really solved the problem.
I can only speculate why this works as my cursory searches did not turn up any documentation about these properties 
As such, I cannot say if these settings will cause any other landscape issues in the future. I can only say that for now, on this immediate issue, they appear to have solved the problem.