Batumi (bɑːˈtuːmi; ბათუმი ˈbɑthumi) is the second-largest city of Georgia and the capital of the Autonomous Republic of Adjara, located on the coast of the Black Sea in Georgia's southwest, 20 kilometers north of the border with Turkey. It is situated in a subtropical zone at the foot of the 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 seaport 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. History of Batumi and Timeline of Batumi Batumi is located on the site of the ancient Greek colony in Colchis called "Bathus" or "Bathys", derived from (βαθύς λιμεν, bathus limen; or βαθύς λιμήν, bathys limēn; lit. the 'deep harbour'). Under Hadrian (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 (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 latter led the unification of the Georgian monarchy in the 11th century. From 1010, it was governed by the eristavi (ერისთავი, viceroy) of the king of Georgia. In the late 15th century, after the disintegration of the Georgian kingdom, Batumi passed to the princes (mtavari, მთავარი) of Guria, a western Georgian principality under the sovereignty of the kings of Imereti. A curious incident occurred in 1444 when a Burgundian flotilla, after a failed crusade against the Ottoman Empire, penetrated the Black Sea and engaged in piracy along its eastern coastline until the Burgundians under the knight Geoffroy de Thoisy were ambushed while landing to raid Vaty, as Europeans then knew Batumi.