I think it goes without saying I'm not the first to have this issue. There is a line that appears on the edge of certain grass planes that have been painted onto the terrain; this doesn't always happen, and not for every detail in your details array for your terrain, but it DOES happen. This is an old issue and still hasn't been fixed. For some people the solution is either: A. Set the texture import wrapping to 'Clamp'. B. Set the image format to 16-Bit. C. Add a transparent border around your details textures. D. Add an alpha layer to each detail texture and have them all in the same folder. As you can see I've done my research and am not bringing up an old issue that has been answered. None of these fixes work for me and this is the latest version of Unity I'm using (5.6.1f1) for Windows 10 64-Bit. Can this issue please be fixed? Are there any other solutions? I'm not interested to know why this happens unless your explanation comes with a solution.