Issue with Missing Texture Section of Map

All of the sudden this section of my map won’t load any textures. I have been using custom textures, I went back through and erased all of the ones I recently added since the issue started. I have been using a modified version of the Universal Landscape Materials and tried loading the original into the landscape level and then going back to my modified version. Neither time did this section fill in. I’ve tried everything I can think of to fix the issue but nothing seems to work. I painted over with surrounding textures that are clearly working, restarted, reloaded, etc. I am totally stumped. Any help would be greatly appreciated. Thanks.