Border guards patrol in Xinjiang's 'mosquito kingdom'(1/6)

Police officers wearing anti-mosquito clothing spray insect repellent to each other during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Zhang Jiaxu)

Located on the north bank of the Irtysh River and bordered by Kazakhstan, Beiwan area is known as one of the four "mosquito kingdoms" in the world.

Police officers wearing anti-mosquito clothing spray insect repellent to each other during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Zhang Jiaxu)

Police officers wearing anti-mosquito clothing spray insect repellent to each other during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Zhang Jiaxu)

Police officers wearing anti-mosquito clothing spray insect repellent to each other during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Zhang Jiaxu)

A police officer repels mosquitoes for a police dog during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Wang Youbo)

A police officer prays insect repellent to a police dog during a patrol in Beiwan area Altay, northwest China's Xinjiang Uyghur Autonomous Region. (Photo: China News Service/Wang Youbo)