The map above shows Northern Mariana Islands and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Northern Mariana Islands vs South Australia Geography
Land area: Northern Mariana Islands has a land area of 179 square miles (464 km²), while South Australia has 380,048 square miles (984,321 km²). South Australia's land area is 2,121.4 times larger than Northern Mariana Islands'.
Total area: Northern Mariana Islands: 179 square miles (464 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water. South Australia's total area is 2,121.4 times larger than Northern Mariana Islands'.
Length: Northern Mariana Islands is 326 miles (524 km) long from north to south; South Australia is 1,078 miles (1,735 km). South Australia's north-south length is 3.3 times (231%) longer than Northern Mariana Islands'.
Width: Northern Mariana Islands spans 278 miles (448 km) east to west; South Australia spans 825 miles (1,328 km). South Australia's east-west width is 3.0 times (197%) wider than Northern Mariana Islands'.
Highest point: Northern Mariana Islands's highest point is Agrihan at 3,166 feet (965 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m). Mount Woodroffe is 1,542 feet higher than Agrihan.
Lowest point: Northern Mariana Islands's lowest point is Pacific Ocean at 0 feet; South Australia's is Lake Eyre at -49 feet. South Australia's lowest point is 49 feet lower.
Northern Mariana Islands vs South Australia Population and History
Population: Northern Mariana Islands has a population of 47,329 (2020), while South Australia has 1,908,182 (2025). South Australia's population is 40.3 times larger than Northern Mariana Islands'.
Population density: Northern Mariana Islands: 264.4 people per square mile vs South Australia: 5.0. Northern Mariana Islands' population density is 52.9 times higher than South Australia's.
History: Northern Mariana Islands: A US commonwealth since 1978. South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836. In its current form, South Australia is the older of the two by 77 years.
Official Websites
Northern Mariana Islands official website · South Australia official website
More Size Comparisons
All Northern Mariana Islands size comparisons · All South Australia size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.