What position is each countries speciality?

After watching Luke Reimer singlehandedly win the game for the Brumbies at 7 this arvo. I was thinking how funny it is that no matter the peaks and troughs of Australian rugby we always manage to just endlessly produce world class open side flankers. McReight, Hooper, Pocock, Smith. Waugh

Are there other countries that seem to just endlessly produce quality players in a single position?