An investigation traces how commonly cited figures for Yemen’s area - often given as 555,000 km² or 527,968 km² - are the product of two distinct historical errors rather than accurate modern measurement. Re-drawing Yemen’s borders on Google Maps (including Socotra) yields about 456,000 km², and the 555,000 figure appears to come from a 1991 statistical yearbook that extended the northern border up to the 20°N latitude; actual treaty lines place Yemen’s northernmost point at 19°N. The 527,968 number in the CIA World Factbook and other databases results from summing older area estimates for North Yemen (195,000 km²) and South Yemen (332,968 km²), but those component figures don’t match mapped boundaries.
Digging into primary sources shows North Yemen’s inflated number traces to a 1904 Ottoman-era vilayet measurement that was wrongly applied to the later state, while South Yemen’s jump in the 1970s stems from a World Bank table that double-counted a territory called Thamud when summing governorates. Those two unrelated errors propagated through encyclopedias and databases for decades, producing incorrect population density and size rankings and illustrating how persistent, unchecked archival mistakes can distort modern geographic statistics.
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