Kiev or Kyiv is the capital and largest city of Ukraine, located in the north central part of the country on the Dnieper River. The population in July 2013 was 1,847,100. The city's name is said to derive from the name of Kyi, one of its four legendary founders. The city probably existed as a commercial centre as early as the 5th century. Kiev has a humid continental climate, the warmest months are June, July, and August, with mean temperatures of 13.8 to 14.8 °C (56.8 to 76.6 °F). The coldest are December, January, and February, with mean temperatures of −4.6 to −1.1 °C (13.7 to 30.0 °F). The Dnieper River naturally divides Kiev into the Right Bank and the Left Bank areas. Historically located on the western right bank of the river, the city expanded into the left bank only in the 10th century. Most of Kiev's attractions are located on the right bank. It is said that one can walk from one end of Kiev to the other in the summertime without leaving the shade of its many trees. Most characteristic are the horse-chestnuts. Kiev has major art galleries and museums plus parks, beaches and boat hire.