Hot-air balloons fly over the Qiongzhou Strait as a balloon festival begins in Haikou, South China's Hainan province, June 18, 2013. [Photo/Xinhua]
Hot-air balloons fly over the city zone during the 7th Hot Air Balloon Festival and 2013 H1 China Hot Air Balloon Challenge in Haikou, capital of South China's Hainan province, June 18, 2013.[Photo/Xinhua]