Batumi (formerly Batum or Batoum) is a seaside city on the Black Sea coast and capital of Ajaria, an autonomous republic in southwest Georgia. Batumi, with its large port and commercial center, is also the last stop of the Trans-Caucasian railroad and the Baku oil pipeline. It is situated some 20 km (12 mi) from the Turkish border, in a subtropical zone, rich in citrus fruit and tea. Industries include oil refineries, shipbuilding, food processing, and light manufacturing. Batumi is located on the site of the ancient Greek colony of Batis. It has been known since the 11th century for its fortifications. The town is home to all the major religions of the Caucasus, with a mixed population of Catholics, Georgian Orthodox and Apostolic Church, Muslims, and Jews. Attractions include the Ajar Museum, botanical gardens, which were started by professor Krasnov (brother of the general Pyotr Krasnov), aquarium, circus, and a former resort area along the Black Sea coast.