If it isn't in
the official list, it is unlikely they're available or Slackware was never notified of a mirror in that country. Your best bet is to either use the "mirrorbrain" option of mirror.slackware.com, which should theoretically find the closest and/or fastest mirror to you or try my
slackware mirror speedtest script to find the fastest one for you out of the official list or the list in /etc/slackpkg/mirror.