Landscape UV stretching help please


I am trying to figure put how to remove the uv stretching from my my landscape.

I imported height-map from world machine (free edition) 505x505
my textures are 1024x1024

I am using custom material.

Picture of problem

Any help would be much appreciated!

Any ideas?

For anybody needing help with this issue.

I fixed the stretching issue, by converting my mountain texture to an object and then used a “worldcoordinate3way” to set it on the YZ channel.
Dont forget to copy and add to normal.