The Levantine Sea is the easternmost part of the Mediterranean Sea.
The Levantine Sea is bordered by Turkey in the north, Syria, Lebanon, Israel and the Gaza Strip in the east, Egypt in the south, and the Aegean Sea in the northwest. The western border to the open Mediterranean (there also called Libyan Sea) is defined as a line from the cape Ras al-Helal in Libya to the island of Gavdos, south of Crete. The largest island in the Levantine Sea is Cyprus. The greatest depth of 4,384 m (14,383 ft) is found in the Pliny Trench, about 80 km (50 mi) south of Crete. The Levantine Sea stretches over an area of 320,000 km2 (120,000 sq mi).
The northern part of the Levantine Sea between Cyprus and Turkey is called the Cilician Sea. Also in the north are two large bays, the Gulf of İskenderun (northeast) and the Gulf of Antalya (northwest).
The Leviathan gas field is located in this area under the Levantine basin in the southeastern part of the Mediterranean.
To the west of the Levantine Deep Marine Basin is the Nile Delta Basin, followed by the Herodotus Basin, 130,000 km2 (50,000 sq mi) large and up to 3,200 m (10,500 ft) deep, which – at a possible age of 340 million years – is believed to be the oldest known ocean crust worldwide.
The Suez Canal was completed in 1869, linking the Levantine Sea to the Red Sea. The Red Sea's level is higher than the Eastern Mediterranean, so the canal serves as a tidal strait that pours Red Sea water into the Mediterranean. The Bitter Lakes, which are hypersaline natural lakes that form part of the canal, blocked the migration of Red Sea species into the Mediterranean for many decades, but as the salinity of the lakes gradually equalized with that of the Red Sea, the barrier to migration was removed, and plants and animals from the Red Sea have begun to colonize the eastern Mediterranean. This migration of species is known as the Lessepsian migration, after Ferdinand de Lesseps, the chief engineer of the canal.
Construction of the Aswan High Dam across the Nile River in the 1960s has reduced the flow of freshwater and silt into the Levantine Sea. This made the sea relatively saltier and nutrient-poor than previously, which led to the collapse of historically important sardine fisheries, and has given an additional advantage to Red Sea species, who are adapted to the saltier and nutrient-poor Red Sea.