Sea of Azov is 1.11× the size of Hainan

The Sea of Azov (sea) covers about 37,600 km² (14,500 mi²) and Hainan (province) about 33,800 km² (13,100 mi²). Below, both outlines are drawn at one scale and centred on each other. The Sea of Azov outline is Natural Earth’s, checked against the published area.

37,600km²Sea of Azov
33,800km²Hainan

100 km

Sea of Azov
Hainan

What fits

Hainan is 90% of the size of Sea of Azov.
Sea of Azov is larger by 3,730 km² (1,440 mi²), which is 11% of the area of Hainan.
Measured in Belgiums: Sea of Azov is about 1.22, Hainan about 1.10.

How they differ

Their centres are about 7,180 km apart.
A standard web map misstates the comparison: Sea of Azov at 46°N is drawn about 2.1× too large and Hainan at 19°N about 1.1×, so the map shows Sea of Azov as 2.07× the size of Hainan instead of 1.11×.
Together Sea of Azov and Hainan cover 71,400 km², close to the size of Sierra Leone (71,600 km², 0.3% bigger).
The gap between them, 3,730 km², is about the size of Cape Verde (3,930 km²).
Sea of Azov's centre is 27.0° of latitude, about 3,000 km, farther north than Hainan's.
The Sea of Azov is a sea and ranks 34th of the 42 seas on sizeversus by area.
Hainan is a province of China; it is not drawn with its waters removed, and its measured area is the Natural Earth outline's.
Laid out flat, the Sea of Azov stretches about 225 km north to south and 339 km east to west; Hainan about 222 km by 254 km.
Poured over Hainan, the 6 km³ that Wikidata records for the Sea of Azov would stand 0.2 m deep.
Wikidata’s published figure of 37,600 km² agrees with our measured 37,600 km², to within 2%.

Who wins on what

Measure	Winner	By
Larger area	Sea of Azov	1.11×
Farther north	Sea of Azov	27.0° of latitude
Stretched more on a web map	Sea of Azov	2.1× against 1.1×

Both against the same yardsticks

Yardstick	Sea of Azov	Hainan
Belgium 30,700 km²	1.22×	1.10×
United Kingdom 244,000 km²	0.15×	0.14×
Germany 358,000 km²	0.11×	0.09×
Japan 374,000 km²	0.10×	0.09×
France 548,000 km²	0.07×	0.06×
India 3,151,000 km²	0.01×	0.01×
Brazil 8,473,000 km²	1 in 226	1 in 250
United States 9,447,000 km²	1 in 251	1 in 279
Russia 16,980,000 km²	1 in 452	1 in 502

Each figure is the place's area divided by the yardstick's.

Side by side

	Sea of Azov	Hainan
Is a	Seasea on sizeversus	ProvinceChina
Area, measured	37,600 km²14,500 mi²	33,800 km²13,100 mi²
Area, published	37,600 km²Wikidata	33,900 km²Wikidata
Rank by area	34th of 42seas	–
Greatest depth	15 mWikidata	–
Volume	6 km³	–
Latitude range	45°N to 47°N	18°N to 20°N
On the shore	2 on the shore	–

Published figures: Wikidata (CC0). A lake or a sea has no legal boundary: the measured area is that of Natural Earth’s outline, and it is shown beside the published one.

Natural Earth’s outlines of Russia and Ukraine lie within 25 km of the outline of the Sea of Azov. That is what its geometry says, and it is not a statement about who owns the water or where any border runs in it.

Similar in size to Sea of Azov

Similar in size to Hainan

More comparisons

Sources and method

Outlines: Lakes and seas: Natural Earth 1:10m physical vectors (public domain), kept only where the measured area is within 10% of the published one. Countries and regions: Natural Earth, 1:10m Admin 0 and Admin 1, public domain.
Boundary: De facto, as drawn by Natural Earth. A lake or a sea has no legal boundary of its own; the outline is a cartographic one.
Area: Measured on the WGS84 ellipsoid from the full-detail outlines, shown rounded. The published figure comes from Wikidata (CC0), fetched 2026-11-11, and is shown beside the measured one.
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: 2026-11-11

Full method