Hmm...wait. El nido is south of all the continents, right??? Well...you can't instantly say that Guardia was the keepe of the frozen flame, then, right?
Maybe it was Porre, Medina, or Choras...but that is SO doubtful that it's crazy. To be honest, I've never even played Chrono Cross, but I've heard bits and pieces.
P.S. off topic for a second, does anybody know where to find a rom or ISO or whatever of Chrono Cross? I've been trying to find one for a few days now.