with the Hellenic Trench. One might conclude that the Trench is the location of the subduction and the border of the Aegean Plate, as some have. As it turns out, the Mediterranean Ridge (MR), also arcuate, curves a little more to the north to intersect the KFZ a little further out than the HT. There is evidence that the KFZ projects further into the Abyssal Plain of the Ionian Sea at an angle to the strike of the previously known KFZ. The Plain is the site of the Mesozoic basement that further east is subducted. It is believed the KFZ may extend into it to a depth of as much as . As the KFZ may terminate both the HT and the MR on the north, either may be the location of the subduction. The location of the border between Aegean Plate and Ionian Sea Plain is again deferred until more definitive evidence can be obtained. The Hellenic Trench from the intersection with the KFZ to south of Crete consists of a line of deep-sea basins named after surface features and divided from each other by gravity rises. The three major parts of the western trench are as follows. The Zakynthos-Strophades basins The KFZ is on the outer border of an archipelago termed (by some) the Southern Ionian Island Chain. The four main islands are Lefkada, Ithaki, Kefalonia, and Zakynthos. The geographical custom in designating the waters between an island and the mainland is to call it a basin: the Zakynthos Basin (ZB), etc. The Southern Ionians also include the diminutive islands around the larger, including the two small islands to the south of Zakynthos, the Strofades. They and Zakynthos are joined by the submarine Zakynthos-Strofades Ridge. The waters around Zakynthos are the ZB; around the Strofades, the SB. The two together are the Zakynthos-Strofades System. Matapan deep The Matapan Deep or Matapan–Vavilov Deep is roughly . The Calypso Deep, located in the Matapan–Vavilov Deep, is roughly deep and is the deepest point in the Mediterranean Sea. Kithera–Antikithera deep The Kithera–Antikithera deep is . The eastern trough Hellenic arc ecology The trench and the arc to the north of it, including a strip of southern Anatolia, are home to some of the larger marine mammals, some of which are endangered species. Accordingly, the ACCOBAMS, an organization based on an international agreement to work for the conservation of these animals, has