 "Joint Operation Poseidon" began on 2006, after Greece asked for surveillance by Frontex of the country's sea and land borders between the EU-member Greece and Turkey.The Joint Operation is divided into two branches, the Poseidon Sea Operation which oversees the sea borders of the EU with Turkey in the Mediterranean and Aegean seas, and the Poseidon Land Operation which oversees the southeastern land border of the EU with Turkey on the Evros river.The operation turned permanent and has been expanded subsequently on the year 2011.