Joadja is a ghost town in the Southern Highlands of New South Wales, Australia, in Wingecarribee Shire. The Southern Highlands is a geographical area in New South Wales, Australia, southwest of Sydney. ... Capital Sydney Government Constitutional monarchy Governor Professor Marie Bashir Premier Morris Iemma (ALP) Federal representation  - House seats 50  - Senate seats 12 Gross State Product (2004-05)  - Product ($m)  $305,437 (1st)  - Product per capita  $45,153/person (4th) Population (End of March 2006)  - Population  6,817,100 (1st)  - Density  8. ... Wingecarribee is a Local Government Area (LGA) southwest of Sydney named after the Wingecarribee River, which flows through it. ...