Mediterranean Sea
Eponymous mediterranean sea enclosed by Africa, Asia, and Europe.
Wikipedia / Wikimedia Commons
The Mediterranean Sea is an intercontinental body of water lying between Europe, Asia, and Africa, almost entirely enclosed by land. It is bounded by the Levant to the east, Anatolia and Southern Europe to the north, and North Africa to the south. Its only natural connection to the Atlantic Ocean is the narrow Strait of Gibraltar, which separates the Iberian Peninsula from Morocco by just 14 kilometers. It also connects to the Black Sea via the Bosporus Strait and to the Red Sea through the Suez Canal. Covering approximately 2.5 million square kilometers, it represents 0.7% of the global ocean surface and includes fifteen marginal seas, such as the Aegean, Adriatic, Tyrrhenian, and Marmara. Geologically, around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and partially or completely dried up for about 600,000 years during the Messinian salinity crisis, before being refilled by the Zanclean flood roughly 5.3 million years ago. The region’s history is foundational to many modern societies, often called an incubator of Western civilization, with early advanced cultures emerging in Egypt, Greece, and the Fertile Crescent. The Levant saw permanent human habitation as early as 12,000 BC. In antiquity, the sea served as a vital route for trade, migration, and cultural exchange, and the Roman Empire maintained nautical control over it for centuries, the only state to ever hold all its coastline. The sea has an average depth of 1,500 meters, with its deepest point at 5,109 meters in the Calypso Deep of the Ionian Sea. Its west–east length from Gibraltar to the Gulf of Alexandretta is about 4,000 kilometers, while the shortest shipping route between the Gulf of Trieste and the Gulf of Sidra is roughly 1,900 kilometers. The water temperatures are mild in winter and warm in summer, defining the Mediterranean climate, with most precipitation falling in cooler months. Hot deserts lie not far inland along southern and eastern coasts, but the immediate coastline experiences strong maritime moderation. The surrounding countries in clockwise order include Spain, France, Italy, Greece, Turkey, Egypt, Libya, Tunisia, Algeria, and Morocco, among others, with Cyprus and Malta as island nations. The two largest islands by area and population are Sicily and Sardinia.
- Marginal seas
- 15, including Aegean, Adriatic, Tyrrhenian, and Marmara
Lore & Background
The Mediterranean Sea is classified as a concentration basin as a whole, meaning it has a higher salinity than the outer ocean due to evaporation, with water exchange consisting of inflow of fresher oceanic water in the upper layer and outflow of saltier mediterranean water in the lower layer of the connecting channel. However, the Adriatic Sea and the Black Sea are dilution basins, having lower salinity due to freshwater gains from rivers: the Adriatic Sea from the Po River, and the Black Sea from the Danube, Dnieper, and Don rivers. In a dilution basin, water exchange consists of outflow of fresher mediterranean water in the upper layer and inflow of saltier oceanic water in the lower layer, and renewal of deep water may not be sufficient to supply oxygen to the bottom.
Reader's Guide
The Mediterranean Sea is the namesake for the oceanographic term 'mediterranean sea,' defined as a mostly enclosed sea with limited water exchange with outer oceans, where circulation is dominated by salinity and temperature differences rather than by winds or tides. As a concentration basin overall, it experiences higher salinity from evaporation, drawing in fresher oceanic water at the surface while exporting saltier water below. Notable exceptions within it are the Adriatic Sea and the Black Sea, which function as dilution basins due to significant freshwater input from major rivers—the Po for the Adriatic, and the Danube, Dnieper, and Don for the Black Sea. In these dilution basins, fresher water flows out at the surface and saltier oceanic water flows in below, and deep-water oxygen renewal may be insufficient. The Mediterranean Sea includes a vast array of marginal seas: the Adriatic Sea, Aegean Sea (including the Sea of Crete and the Thracian Sea), Alboran Sea, Balearic Sea, Sardinian Sea, Black Sea, Ionian Sea, Ligurian Sea, Sea of Azov, Sea of Marmara, and Tyrrhenian Sea.
Did You Know?
- The Mediterranean Sea is the eponymous example of a 'mediterranean sea,' a mostly enclosed sea with limited water exchange with outer oceans.
- As a concentration basin, the Mediterranean Sea has higher salinity than the outer ocean due to evaporation.
- The Adriatic Sea and the Black Sea are dilution basins within the Mediterranean, fed by the Po River and the Danube, Dnieper, and Don rivers respectively.
- In dilution basins like the Black Sea, renewal of deep water may not be sufficient to supply oxygen to the bottom.
- The Mediterranean Sea includes the Adriatic Sea, Aegean Sea, Alboran Sea, Balearic Sea, Sardinian Sea, Black Sea, Ionian Sea, Ligurian Sea, Sea of Azov, Sea of Marmara, and Tyrrhenian Sea.
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