Odessa was a coastal city in Ukraine.
Following Day 8, Jack Bauer assumed a new identity as "Borys" and lived in Odessa while hiding from the American and Russian governments. He found work as a longshoreman at the city's commercial seaport and began dating Sofiya, the sister of his coworker Petro. However, in the process of helping Petro pay off his brother's debts to a local Russian mafia leader, Jack hijacked and stole a methylamine shipment, an act that resulted in his being identified by CIA agents in the region. (Underground #1)