Odessa or Odesa is the administrative center of the Odessa Oblast (province) located in southern Ukraine. The city is a major seaport located on the shore of the Black Sea and the fourth largest city in Ukraine

The predecessor of Odessa, a small Tatar settlement, was founded by Hacı I Giray, the Khan of Crimea, in 1240 and originally named after him as "Hacıbey". After a period of Lithuanian control, it passed into the domain of the Ottoman Sultan in 1529 and remained in Ottoman hands until the Ottoman Empire's defeat in the Russo-Turkish War of 1792. The city of Odessa was founded by a decree of the Empress Catherine the Great in 1794. From 1819–1858 Odessa was a free port. During the Soviet period it was the most important port of trade in the Soviet Union and a Soviet naval base. On January 1, 2000 the Quarantine Pier of Odessa trade sea port was declared a free port and free economic zone for a term of 25 years.