Foreign students take photos of the Danxia red-sandstone formations in Gansu province's Zhangye with their phones on April 12, 2017. More than 180 foreign students from Kyrgyzstan, Kazakhstan and Uzbekistan visited natural scenes and cultural relic sites along the Hexi corridor, a fertile region that is an important part of the Silk Road in Gansu province, from April 11 to 14. Northwest Normal University and the province's Overseas Chinese Affairs Office organized this trip.