I know I just asked a question, but I'm not afraid to ask another...

I made a map with worldspace editor, and with Heightmap editor. It is a mountainous map with lots of tall mountains, but when I go to the top of one, I see a border, and past that all I see is white. I wanna see a lot of mountains in the distance, and I wanna have very long visibility range. Don't worry, my computer can handle it, it does not lag at all on medium quality in the wasteland... Is there a setting or an option to change the visibility range or
something? If so please tell me and/or explain how to enable it.... Thanks for your help...