Curious Canberra

On a map, it's easy to see that the suburb of Kambah is larger than most. The south Canberra suburb is around four times the size of the average suburb in the ACT. So why is it so big? And is it true that it's the largest suburb in the southern hemisphere? Reporter Sonya Gee attempts to answer this question from Graham Fuller, Aden Cotterill and Ben Chapman.