Sow's foot is a distict filled with exotic races and cultures were they can have them be more common, instead of just odd balls here and there.
To a lesser extent I could see some of that in Twin Songs as well. Genasi being in Little Calimshan as well. Tritons might be under the water in the River if we can go underwater. Tymora's temple might have an Aasimar or two as clerics or Paladins.
