g'day bidgee and dlinth firstly let me reveal my interests and just say i am a sandgroper but i am also a wikipedian with a commitment to order and integrity i had earlier thought that perth was the most isolated city in the world with a population over a million with the closest city of comparable size being surabaya or jakarta in fact neither fact was true which i confirmed by using the online gis application mapcrow i believe that using the same gis application should confirm distances and any comparisions between different pairs of cities