Nagano is 1.13× the size of Île-de-France

Nagano (prefecture of Japan) covers about 13,700 km² (5,290 mi²) and Île-de-France (region of France) about 12,100 km² (4,670 mi²). Below, both outlines are drawn at one scale and centred on each other.

13,700km²Nagano
12,100km²Île-de-France

50 km

Nagano
Île-de-France

What fits

Île-de-France is 88% of the size of Nagano.
Nagano is larger by 1,590 km² (614 mi²), which is 13% of the area of Île-de-France.
Measured in Belgiums: Nagano is about 0.45, Île-de-France about 0.39.

How they differ

Nagano is larger, but Île-de-France has the larger population: 12.4 million against 2.0 million, 6.12× as many people.
Per square kilometre that is 1,023 in Île-de-France against 148 in Nagano: Île-de-France is 6.92× as densely populated.
Their centres are about 9,610 km apart.
On a standard web map Île-de-France looks larger than Nagano: Nagano at 36°N is drawn about 1.5× too large and Île-de-France at 49°N about 2.3×, so the map shows Île-de-France as 1.32× the size of Nagano, when Nagano is 1.13× the size of Île-de-France.
Together Nagano and Île-de-France cover 25,800 km², close to the size of North Macedonia (25,400 km², 1.6% smaller).
The gap between them, 1,590 km², is about the size of Comoros (1,670 km²).
At Île-de-France's density, Nagano would have 14.0 million people (it has 2.0 million). At Nagano's density, Île-de-France would have 1.8 million (it has 12.4 million).
Île-de-France's centre is 12.6° of latitude, about 1,400 km, farther north than Nagano's.
Nagano is the 4th largest of the 47 prefectures of Japan and covers 3.7% of its area; it is the 38th most densely populated of them.
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.
Île-de-France lies about 13° of latitude (roughly 1,400 km) north of Nagano.
Shared out evenly, each person in Nagano would have about 6,770 m² and each person in Île-de-France about 980 m².
Laid side by side, Nagano and Île-de-France would cover 25,800 km², about the same size as North Macedonia.
Together they have 14.4 million people, about as many people as Rwanda.

Side by side

	Nagano	Île-de-France
Is a	PrefectureJapan	RegionFrance
Area, measured	13,700 km²5,290 mi²	12,100 km²4,670 mi²
Official area	13,600 km²Wikidata	12,000 km²Wikidata
Rank by area	4th of 47in Japan	13th of 18in France
Population	2.0 millionWikidata, 2021	12.4 millionWikidata, 2022
Rank by population	16th of 47in Japan	1st of 18in France
Density	148 per km²	1,023 per km²
Capital	Nagano	Paris
Latitude range	35°N to 37°N	48°N to 49°N

Population: Wikidata 2021 and Wikidata 2022. Official figures: Wikidata (CC0).

Wikidata's official figure of 13,600 km² agrees with our measured area of 13,700 km², to within 2%.
Wikidata's official figure of 12,000 km² agrees with our measured area of 12,100 km², to within 2%.

Similar in size to Nagano

Similar in size to Île-de-France

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