Tourists enjoy prairie scenery on Jinlianchuan Prairie in Zhenglan Qi, north China's Inner Mongolia Autonomous Region, July 15, 2018. A trollius festival was opened here on Sunday. (Xinhua/Liu Lei)

Aerial photo taken on July 15, 2018 shows tourists walking on a footpath on Jinlianchuan Prairie in Zhenglan Qi, north China's Inner Mongolia Autonomous Region. A trollius festival was opened here on Sunday. (Xinhua/Liu Lei)

Herdsmen ride horses on Jinlianchuan Prairie in Zhenglan Qi, north China's Inner Mongolia Autonomous Region, July 15, 2018. A trollius festival was opened here on Sunday. (Xinhua/Liu Lei)

Tourists enjoy prairie scenery on Jinlianchuan Prairie in Zhenglan Qi, north China's Inner Mongolia Autonomous Region, July 15, 2018. A trollius festival was opened here on Sunday. (Xinhua/Liu Lei)

Artists of an Ulan Muqir art troupe perform a dance on Jinlianchuan Prairie in Zhenglan Qi, north China's Inner Mongolia Autonomous Region, July 15, 2018. A trollius festival was opened here on Sunday. (Xinhua/Liu Lei)