Batumi (/bɑːˈtuːmi/; Georgian: ბათუმი [bɑtʰumi]) is the capital of the Autonomous Republic of Adjara and the second largest city of Georgia, located on the coast of the Black Sea in the country's southwest. It is situated in a Subtropical Zone at the foot of Caucasus. Much of Batumi's economy revolves around tourism and gambling (It is nicknamed "The Las Vegas of the Black Sea"), but the city is also an important sea port and includes industries like shipbuilding, food processing and light manufacturing. Since 2010, Batumi has been transformed by the construction of modern high-rise buildings, as well as the restoration of classical 19th-century edifices lining its historic Old Town.
Batumi is located on the site of the ancient Greek colony in Colchis called "Bathus" or "Bathys" – derived from (Greek: βαθύς λιμεν, bathus limen; or βαθύς λιμήν, bathys limēn; lit. the 'deep harbor'). Under Hadrian (c. 117–138 AD), it was converted into a fortified Roman port and later deserted for the fortress of Petra founded in the time of Justinian I (c. 527–565). Garrisoned by the Roman-Byzantine forces, it was formally a possession of the kingdom of Lazica until being occupied briefly by the Arabs, who did not hold it; In 780 Lazica fell to kingdom of Abkhazia via a dynastic union, the later led the unification of Georgian monarchy in the 11th century.