you can now click on the flag in your profile page and go to a page that shows other photographers and galleries from that country.
also, the edit gallery page now has a popup menu for location.
if appropriate, you can choose a country for a gallery.
list of all countries at http://www.pbase.com/world
it's just a start. will evolve over the years with better navigation and more information.
also, there are not many galleries or photographers listed yet because this is very new.
-slug