Horses gallop across grasslands in the Shandan Army Horse-breeding Farm of Zhangye, Northwest China's Gansu province on Feb 15. [Photo provided to chinadaily.com.cn]

Thousands of horses gallop across snow-covered grasslands in the Shandan Army Horse-breeding Farm of Zhangye, Northwest China's Gansu province on Feb 15.

The horse farm, located at Damaying Grassland on the northern slope of Lenglong Peak of Qilian Mountains in the center of Hexi Corridor, is one of the oldest and largest in the world, covering a total area of about 2,200 sq km and is traced back to the Western Han Dynasty (206 BC- AD 24).