Sea of Marmara is 1.01× the size of Tianjin

The Sea of Marmara (sea) covers about 11,600 km² (4,460 mi²) and Tianjin (municipality) about 11,500 km² (4,430 mi²). Below, both outlines are drawn at one scale and centred on each other. The Sea of Marmara outline is Natural Earth’s, checked against the published area.

11,600km²Sea of Marmara
11,500km²Tianjin

50 km

Sea of Marmara
Tianjin

What fits

Tianjin is 99% of the size of Sea of Marmara.
Sea of Marmara is larger by 83.9 km² (32.4 mi²), which is 0.7% of the area of Tianjin.
Measured in Belgiums: Sea of Marmara is about 0.38, Tianjin about 0.37.

How they differ

Their centres are about 7,230 km apart.
Together Sea of Marmara and Tianjin cover 23,000 km², close to the size of Belize (22,300 km², 3.2% smaller).
Sea of Marmara's centre is 1.4° of latitude, about 160 km, farther north than Tianjin's.
The Sea of Marmara is a sea and ranks 41st of the 42 seas on sizeversus by area.
Tianjin is a municipality 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 Marmara stretches about 84 km north to south and 268 km east to west; Tianjin about 189 km by 115 km.
Poured over Tianjin, the 3,378 km³ that Wikidata records for the Sea of Marmara would stand 294 m deep.
Wikidata’s published figure of 11,400 km² agrees with our measured 11,600 km², to within 2%.

Who wins on what

Measure	Winner	By
Larger area	Sea of Marmara	1.01×
Farther north	Sea of Marmara	1.4° of latitude

Both against the same yardsticks

Yardstick	Sea of Marmara	Tianjin
Belgium 30,700 km²	0.38×	0.37×
United Kingdom 244,000 km²	0.05×	0.05×
Germany 358,000 km²	0.03×	0.03×
Japan 374,000 km²	0.03×	0.03×
France 548,000 km²	0.02×	0.02×
India 3,151,000 km²	1 in 273	1 in 275
Brazil 8,473,000 km²	1 in 733	1 in 738
United States 9,447,000 km²	1 in 817	1 in 823
Russia 16,980,000 km²	1 in 1,469	1 in 1,480

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

Side by side

	Sea of Marmara	Tianjin
Is a	Seasea on sizeversus	MunicipalityChina
Area, measured	11,600 km²4,460 mi²	11,500 km²4,430 mi²
Area, published	11,400 km²Wikidata	11,900 km²Wikidata
Rank by area	41st of 42seas	–
Greatest depth	1,370 mWikidata	–
Volume	3,378 km³	–
Latitude range	40°N to 41°N	39°N to 40°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 Turkey lie within 25 km of the outline of the Sea of Marmara. 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 Marmara

Similar in size to Tianjin

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