Sea
Sea of Marmara
Natural Earth’s outline of the Sea of Marmara measures about 11,600 km² (4,460 mi²), the 41st largest of the 42 seas on sizeversus, and 1.04× the size of Qatar.
50 km
- Sea of Marmara
- Qatar
The numbers
- 11,600km²Area, measured4,460 mi² · Natural Earth outline
- 11,400km²Area, publishedWikidata · agrees within 2%
- 1,370mGreatest depthaverage about 292 m
- 3,378km³VolumeWikidata
The area is measured from the outline drawn above, on the WGS84 ellipsoid; the published figure is shown beside it, and a water body is kept only if the two are within 10%.
What the numbers say about the Sea of Marmara
- The Arabian Sea, the largest of the 42 seas ranked on sizeversus, is 357× the size of the Sea of Marmara; the Sea of Marmara ranks 41st.
- The Sea of Marmara sits between the Chesapeake Bay (11,700 km²) and the Frobisher Bay (9,030 km²) in the ranking.
- Counted as a country, the Sea of Marmara would be larger than 50 of the 212 countries listed on sizeversus and would rank 163rd by area, between Falkland Islands (11,600 km²) and Qatar (11,200 km²).
- It is larger than 3 of the 51 US states and districts (the biggest of them is Delaware, 5,170 km²) and smaller than 48.
- It is larger than 2 of the 31 provinces and regions of China (the biggest of them is Tianjin, 11,500 km²) and smaller than 29.
- The closest Chinese province is Tianjin (11,500 km²): the Sea of Marmara is about the same size as Tianjin.
- Wikidata records a greatest depth of 1,370 m; with its volume that gives an average depth of about 292 m.
- Wikidata records a volume of 3,378 km³. Poured over Belgium (30,700 km²), that water would stand 110 m deep.
- On a standard web map (Web Mercator), a place at 41°N is drawn about 1.7× too large in area, so the Sea of Marmara looks bigger there than it is.
- Laid out flat, the Sea of Marmara stretches about 84 km north to south and 268 km east to west.
- Wikidata’s published figure of 11,400 km² agrees with our measured 11,600 km², to within 2%.
About the same size as
Countries
On the shore
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.
Where the Sea of Marmara ranks
The Sea of Marmara is the 41st largest of the 42 seas on sizeversus, ranked by measured area.
Compare the Sea of Marmara
Share this outline
Sources and method
- Outline
- Natural Earth, 1:10m Marine Areas (geography_marine_polys), public domain (Marine Areas (geography_marine_polys)). Natural Earth draws marine areas for labels and cuts them at named sub-areas; the outline is kept because its area matches the published one.
- Boundary
- A lake or a sea has no legal boundary of its own. The outline is a cartographic one, and the page says so by showing the measured area beside the published one.
- Area basis
- Measured outline: computed on the WGS84 ellipsoid from the full-detail outline and shown rounded. Published figure: Wikidata (CC0), fetched 2026-11-11. An outline is kept within 10% of the published figure and matched to other places automatically within 5%.
- Depth, volume, height
- As recorded in Wikidata; a volume that cannot be right for the area and depth is left out.
- Shore
- Countries whose Natural Earth outline contains or comes close to the water's outline; computed, not a statement of ownership.
- Drawing
- Each outline is projected with an equal-area projection centred on its own centroid, so areas stay true and two can be laid over each other.
- Data built
- 2026-11-11