Aerial view of Ansai District of Yan'an, NW China's Shaanxi - Xinhua

190512) -- YAN AN , May 12, 2019 (Xinhua) -- Aerial photo taken on

Aerial view of Yan'an City, NW China

Aerial view of Yan'an City, NW China's Shaanxi Province - People's

China's Yan'an returns 10.77 mln mu cultivated land to forests

Aerial view of Ansai District of Yan'an, NW China's Shaanxi

Aerial views of northwest China's Yan'an - Xinhua

View of landmarks in time-honored city of Xi'an-Xinhua

Fly over stunning landscapes in Xi'an-Xinhua

Aerial views of northwest China's Yan'an - Xinhua

Yan'an in NW China's Shaanxi sees landscape improve greatly

Great changes have taken place in China's former revolutionary

View of landmarks in time-honored city of Xi'an-Xinhua