The Hellenic Trench is a hemispherical-scale long narrow depression in the Ionian Sea.
The hadal zone of the Hellenic trench is roughly 4,150 metres (13,615 feet) to 5,300 metres (17,388 feet) deep. The names of the three major parts of the Hellenic trench are: Matapan Deep System or Matapan–Vavilov Deep, roughly 5,120 meters (16,797 feet), the Kithera–Antikithera System, 4,615 metres (15,141 feet), and the Zakinthos–Strofadhes system, 4,150 metres (13,615 feet).

The Calypso Deep, located in the Hellenic Trench, is roughly 5,267 metres (17,280 feet) deep and is the deepest point in the Mediterranean Sea.
The region of the Hellenic trench is an ecosystem to sperm whales and other aquatic life. The trench has been used by marine biologists to study the behaviour of various aquatic species.
This is the trench where several earthquakes, including the 365 Crete earthquake, occurred.

  • 1. [South Aegean Volcanic Arc] The South Aegean Volcanic Arc is a chain of volcanic islands in the South Aegean Sea formed by plate tectonics as a consequence of the subduction of the African tectonic plate beneath the Eurasian plate. The southern Aegean is one of the most rapidly deforming regions of the Himalayan-Alpine mountain belt.
  • 2. [Hellenic arc] The Hellenic arc or Aegean arc is an arcuate tectonic feature of the eastern Mediterranean Sea related to the subduction of the African Plate beneath the Aegean Sea Plate. It consists of an oceanic trench, the Hellenic Trench, on its outer side; two arcs—a non-volcanic outer arc and an inner volcanic arc, the South Aegean Volcanic Arc; and a marginal sea on its inner side.
  • 3. [Calypso Deep] Calypso Deep, located in the Ionian Sea south-west of Pylos, Greece, is the deepest part of the Mediterranean Sea, with a maximum depth of 5,267 m (17,280 ft), at 36°34′N 21°8′E.
  • 4. [365 Crete earthquake] The AD 365 Crete earthquake occurred at about sunrise on 21 July in the Eastern Mediterranean, with an assumed epicentre near Crete. Geologists today estimate the undersea earthquake to have been a magnitude eight or higher, causing widespread destruction in central and southern Greece, northern Libya, Egypt, Cyprus, Sicily and Spain. In Crete, nearly all towns were destroyed.
  • 5. [Hadal zone] The hadal zone (named after the realm of Hades, the underworld in Greek mythology), also known as the hadopelagic zone and trench zone, is the delineation for the deepest trenches in the ocean. This zone is found from a depth of around 6,000 metres (20,000 ft) to the bottom of the ocean. The hadal zone has low population and low diversity of marine life.
  • 6. [Santorini] Santorini (Greek: Σαντορίνη, pronounced [sandoˈrini]), classically Thera (English pronunciation /ˈθɪərə/), and officially Thira (Greek: Θήρα [ˈθira]), is an island in the southern Aegean Sea, about 200 km (120 mi) southeast of Greece's mainland. It is the largest island of a small, circular archipelago which bears the same name and is the remnant of a volcanic
  • 7. [Ionian Sea] The Ionian Sea (Greek: Ιόνιο Πέλαγος, Greek pronunciation: [iˈonio ˈpelaɣos], Italian: Mar Ionio, Italian pronunciation: [mar ˈjɔːnjo], Albanian: Deti Jon) is an elongated embayment of the Mediterranean Sea, south of the Adriatic Sea. It is bounded by southern Italy including Calabria, Sicily, and the Salento peninsula to the west, southern Albania to the north, and west coast of Greece.
  • 8. [Sperm whale] The sperm whale (Physeter macrocephalus), or cachalot, is the largest of the toothed whales and the largest toothed predator. It is the only living member of genus Physeter, and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia.
  • 9. [Mediterranean Sea] The Mediterranean Sea (/ˌmɛdɪtəˈrniən/) is a sea connected to the Atlantic Ocean surrounded by the Mediterranean region and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The sea is sometimes considered a part of the Atlantic Ocean, although it is usually identified as a separate body of water.
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