2.5 million square kilometers

Photo from Wikimedia Commons
Mediterranean Sea
The inland sea at the crossroads of European, African, and Asian civilizations/Oceans & Seas
The Mediterranean Sea is an almost-enclosed body of water connected to the Atlantic through the narrow Strait of Gibraltar. It covers about 2.5 million square kilometers and has an average depth of 1,500 m, reaching a maximum of 5,267 m in the Calypso Deep off the coast of Greece. The name means 'middle of the Earth' in Latin, and it has been central to human civilization for millennia: the Phoenicians, Greeks, Romans, Byzantines, and Ottoman Turks all built empires around its shores.
Measurements
Surface area2.5 trillion m2
489 millionWhite Houses
16.7 quadrillionHuman thumbnails
8.2 hundredthsAfricas
East-west length3.9 million m
3 tenthsEarth diameters
21.4 millionCarrot lengths
62.3 quadrillionHelium atoms
Gibraltar to Levant coast
Maximum width1.6 million m
4,848Eiffel Towers
2,957One World Trade Centers
North to south
Average depth1,500 m
205Extension ladders
26.5Leaning Towers of Pisa
Mean depth
Maximum depth5,267 m
1.92Golden Gate Bridges
1,053Bamboo pole lengths
3.5 millionStacked pennies
Calypso Deep, SW of Greece
Strait of Gibraltar width14,300 m
476,667Olive lengths
238,333Thumb lengths
2,043Tow truck lengths
Narrowest point to Atlantic