Ding, ding, ding! We have bingo, ladies and gents.
Thank you so much for remembering! I'm going to re-read it and hope I still like it.
Yes, the series started out good then maybe got a little repetitive so I gave up on it. I also started getting away from fantasy. Plus at some point...
I wouldn't be one bit surprised if I've mingled a few books in my memory. The Georgia setting could be wrong.
If I'm not reading something based in Britain, then I often find myself reading something set in the South. As I'm a Yankee, it must be longing/envy. :)
The main characters are high school to college age.
Set in the southern United States. I want to say rural Georgia, but I'm not sure.
One or more of the characters were involved in the Society of Creative Anachronism, or something similar.
There is a link to Tir Na Nog using ley lines or...