The map above shows Japan and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Japan vs South Australia Geography
Land area: Japan has a land area of 140,752 square miles (364,546 km²), while South Australia has 380,048 square miles (984,321 km²). South Australia's land area is 2.7 times (170%) larger than Japan's.
Total area: Japan: 145,937 square miles (377,975 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water. South Australia's total area is 2.6 times (160%) larger than Japan's.
Length: Japan is 1,557 miles (2,505 km) long from north to south; South Australia is 1,078 miles (1,735 km). Japan's north-south length is 1.4 times (44%) longer than South Australia's.
Width: Japan spans 1,568 miles (2,524 km) east to west; South Australia spans 825 miles (1,328 km). Japan's east-west width is 1.9 times (90%) wider than South Australia's.
Highest point: Japan's highest point is Mount Fuji at 12,388 feet (3,776 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m). Mount Fuji is 7,680 feet higher than Mount Woodroffe.
Lowest point: Japan's lowest point is Hachirogata at -13 feet; South Australia's is Lake Eyre at -49 feet. South Australia's lowest point is 36 feet lower.
Japan vs South Australia Population and History
Population: Japan has a population of 122,680,000 (2026), while South Australia has 1,908,182 (2025). Japan's population is 64.3 times larger than South Australia's.
Population density: Japan: 871.6 people per square mile vs South Australia: 5.0. Japan's population density is 174.3 times higher than South Australia's.
Largest metro area: Japan's largest metropolitan area is Tokyo (33,412,512 people) vs South Australia's Greater Adelaide (1,491,015). Tokyo's population is 22.4 times larger than Greater Adelaide's.
History: Japan: An independent state for over two millennia; the current constitution dates from 1947. South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836. In its current form, Japan is the older of the two by 1,241 years.
Japan vs South Australia Economy
GDP: Japan's GDP is $4,435.2 billion (2025) vs South Australia's $100.2 billion. Japan's economic output is 44.3 times larger than South Australia's.
GDP per capita: Japan: $35,951 per person vs South Australia: $52,511. South Australia's GDP per capita is 1.5 times (46%) higher than Japan's.
Official Websites
Japan official website · South Australia official website
More Size Comparisons
All Japan 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.