Bohai Sea and Serbia are almost exactly the same size

The Bohai Sea (sea) covers about 77,900 km² (30,100 mi²) and Serbia (country) about 77,600 km² (30,000 mi²). Their outlines are laid over each other below at one scale. The Bohai Sea outline is Natural Earth’s, checked against the published area.

77,900km²Bohai Sea
77,600km²Serbia

100 km

Bohai Sea
Serbia

What fits

Serbia is 100% of the size of Bohai Sea.
The measured areas differ by 238 km², less than half a percent: closer than the measurement itself is certain.
Measured in Belgiums: Bohai Sea is about 2.54, Serbia about 2.53.

How they differ

Their centres are about 7,730 km apart.
On a standard web map Serbia looks larger than Bohai Sea: Bohai Sea at 39°N is drawn about 1.7× too large and Serbia at 44°N about 1.9×, so the map shows Serbia as 1.17× the size of Bohai Sea, when Bohai Sea is 1.00× the size of Serbia.
Together Bohai Sea and Serbia cover 155,000 km², close to the size of Tunisia (157,000 km², 0.7% bigger).
Serbia's centre is 5.2° of latitude, about 580 km, farther north than Bohai Sea's.
The Bohai Sea is a sea and ranks 31st of the 42 seas on sizeversus by area.
Serbia ranks 117th of 212 countries by area.
Laid out flat, the Bohai Sea stretches about 429 km north to south and 404 km east to west; Serbia about 438 km by 329 km.
Wikidata’s published figure of 77,000 km² agrees with our measured 77,900 km², to within 2%.

Who wins on what

Measure	Winner	By
Larger area	Bohai Sea	1.00×
Farther north	Serbia	5.2° of latitude
Stretched more on a web map	Serbia	1.9× against 1.7×

Both against the same yardsticks

Yardstick	Bohai Sea	Serbia
Belgium 30,700 km²	2.54×	2.53×
United Kingdom 244,000 km²	0.32×	0.32×
Germany 358,000 km²	0.22×	0.22×
Japan 374,000 km²	0.21×	0.21×
France 548,000 km²	0.14×	0.14×
India 3,151,000 km²	0.02×	0.02×
Brazil 8,473,000 km²	0.01×	0.01×
United States 9,447,000 km²	0.01×	0.01×
Russia 16,980,000 km²	1 in 218	1 in 219

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

Side by side

	Bohai Sea	Serbia
Is a	Seasea on sizeversus	CountryEurope
Area, measured	77,900 km²30,100 mi²	77,600 km²30,000 mi²
Area, published	77,000 km²Wikidata	88,500 km²Wikidata
Rank by area	31st of 42seas	117th of 212countries
Greatest depth	30 mWikidata	–
Latitude range	37°N to 41°N	42°N to 46°N
On the shore	1 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 China lie within 25 km of the outline of the Bohai Sea. 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 Bohai Sea

Similar in size to Serbia

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