Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Aerial photo taken on July 26, 2019 shows the scenery of terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)

Tourists visit the terraced field in Pengyang County of Guyuan, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Yang Zhisen)