User blog comment:Darkcloud1111/''The Mark of Athena'' Plot Holes/@comment-4515675-20121021160447/@comment-3146930-20121021170355

That I can understand. Gaea is the earth itself, essentially making her everywhere. The borders may be able to keep out monsters and hide the camp from human eyes, but demigods are able to pass it and gods seem to have to trouble. While the border may give them some protection from enemy forces, I don't think it has the power to completely block Gaea's power.