Well done, Goldtruck, Whyalla is correct, SAs 3rd largest town, home to the Whyalla smelters which service ore from Iron Baron, Iron Duke, Iron Prince, Iron Knight and Iron Knob. was previously known as Hummock Hill until 1920. Water was barged in from Pt Pirie until the pipeline from the Murray was constructed. Whyalla also was home to ship building from the 1940s with the first corvette constructed named after the town
Over to you.