Île-de-France is 1.11× the size of Udon Thani

Île-de-France (region of France) covers about 12,100 km² (4,670 mi²) and Udon Thani (province of Thailand) about 10,900 km² (4,200 mi²). Below, both outlines are drawn at one scale and centred on each other.

12,100km²Île-de-France
10,900km²Udon Thani

50 km

Île-de-France
Udon Thani

What fits

Udon Thani is 90% of the size of Île-de-France.
Île-de-France is larger by 1,240 km² (478 mi²), which is 11% of the area of Udon Thani.
Measured in Belgiums: Île-de-France is about 0.39, Udon Thani about 0.35.

How they differ

Île-de-France also has the larger population: 12.4 million against 1.6 million, 7.90× as many people.
Per square kilometre that is 1,023 in Île-de-France against 144 in Udon Thani: Île-de-France is 7.09× as densely populated.
Their centres are about 9,290 km apart.
A standard web map misstates the comparison: Île-de-France at 49°N is drawn about 2.3× too large and Udon Thani at 17°N about 1.1×, so the map shows Île-de-France as 2.33× the size of Udon Thani instead of 1.11×.
Together Île-de-France and Udon Thani cover 23,000 km², close to the size of Belize (22,300 km², 2.9% smaller).
The gap between them, 1,240 km², is about the size of São Tomé and Príncipe (1,040 km²).
At Udon Thani's density, Île-de-France would have 1.7 million people (it has 12.4 million). At Île-de-France's density, Udon Thani would have 11.1 million (it has 1.6 million).
Île-de-France's centre is 31.3° of latitude, about 3,480 km, farther north than Udon Thani's.
Île-de-France is the 13th largest of the 18 regions of France and covers 1.9% of its area; it is the most densely populated of them.
Udon Thani is the 13th largest of the 77 provinces of Thailand and covers 2.1% of its area; it is the 29th most densely populated of them.
Île-de-France lies about 31° of latitude (roughly 3,480 km) north of Udon Thani.
Shared out evenly, each person in Île-de-France would have about 980 m² and each person in Udon Thani about 6,930 m².
Laid side by side, Île-de-France and Udon Thani would cover 23,000 km², 1.03× the size of Belize.
Together they have 13.9 million people, about as many people as Benin.

Side by side

	Île-de-France	Udon Thani
Is a	RegionFrance	ProvinceThailand
Area, measured	12,100 km²4,670 mi²	10,900 km²4,200 mi²
Official area	12,000 km²Wikidata	11,700 km²Wikidata
Rank by area	13th of 18in France	13th of 77in Thailand
Population	12.4 millionWikidata, 2022	1.6 millionWikidata, 2020
Rank by population	1st of 18in France	7th of 77in Thailand
Density	1,023 per km²	144 per km²
Capital	Paris	Udon Thani
Latitude range	48°N to 49°N	17°N to 18°N

Population: Wikidata 2022 and Wikidata 2020. Official figures: Wikidata (CC0).

Wikidata's official figure of 12,000 km² agrees with our measured area of 12,100 km², to within 2%.
Our measured 10,900 km² is 7.3% below Wikidata's official figure of 11,700 km². Official figures can include inland water or count land that an outline draws differently. This difference is flagged for review.

Similar in size to Île-de-France

Similar in size to Udon Thani

More comparisons

Sources and method

Outlines: Natural Earth, 1:10m Admin 1 - States, Provinces, public domain. The outline of Île-de-France is the departments Natural Earth draws there, joined along their shared borders.
Boundary: De facto, as drawn by Natural Earth. A region is drawn whole, every island included; a country is its main territory.
Area: Measured on the WGS84 ellipsoid from the full-detail outlines, shown rounded.
Drawing: Each outline is projected with an equal-area projection centred on its own centroid, so areas stay true and the two can be laid over each other.
Data built: 2026-11-12

Full method