The Ukrainian seaport of Odessa is located on the Black Sea in the south of Ukraine. It is the country's third largest city and a major port, with a population of over one million people. Odessa is an important cultural and economic center, and is known for its vibrant nightlife and beautiful architecture. It is also a popular tourist destination, with many attractions such as the Potemkin Steps, the Odessa Opera House, and the Odessa Catacombs.