The map above shows Northern Ireland and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Northern Ireland vs South Australia Geography
Land area: Northern Ireland has a land area of 5,236 square miles (13,562 km²), while South Australia has 380,048 square miles (984,321 km²). South Australia's land area is 72.6 times larger than Northern Ireland's.
Total area: Northern Ireland: 5,456 square miles (14,130 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water. South Australia's total area is 69.7 times larger than Northern Ireland's.
Length: Northern Ireland is 83 miles (134 km) long from north to south; South Australia is 1,078 miles (1,735 km). South Australia's north-south length is 13.0 times longer than Northern Ireland's.
Width: Northern Ireland spans 107 miles (173 km) east to west; South Australia spans 825 miles (1,328 km). South Australia's east-west width is 7.7 times (671%) wider than Northern Ireland's.
Highest point: Northern Ireland's highest point is Slieve Donard at 2,789 feet (850 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m). Mount Woodroffe is 1,919 feet higher than Slieve Donard.
Lowest point: Northern Ireland's lowest point is Irish Sea at 0 feet; South Australia's is Lake Eyre at -49 feet. South Australia's lowest point is 49 feet lower.
Northern Ireland vs South Australia Population and History
Population: Northern Ireland has a population of 1,905,000 (2022), while South Australia has 1,908,182 (2025). Northern Ireland and South Australia have about the same population.
Population density: Northern Ireland: 363.8 people per square mile vs South Australia: 5.0. Northern Ireland's population density is 72.8 times higher than South Australia's.
History: Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. 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 20 years.
Northern Ireland vs South Australia Economy
GDP: Northern Ireland's GDP is $58.8 billion (2022) vs South Australia's $100.2 billion. South Australia's economic output is 1.7 times (70%) larger than Northern Ireland's.
GDP per capita: Northern Ireland: $30,686 per person vs South Australia: $52,511. South Australia's GDP per capita is 1.7 times (71%) higher than Northern Ireland's.
Official Websites
Northern Ireland official website · South Australia official website
More Size Comparisons
All Northern Ireland 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.