Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)

Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)

Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)

Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)

Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)

Photo taken on Oct. 30, 2019 shows the autumn scenery of Xarusgol River in Ordos, north China's Inner Mongolia Autonomous Region. The river is an important tributary of the Yellow River. (Photo: Xinhua)