How to better identify the location of these land forms?
札达土林 is not Zanda County, but rather the Zhada Earth Forest National Geopark. Note that 札达 in Standard Mandarin pinyin is Zhádá, hence the English translation. The native Tibetan version, རྩ་མདའ, is transliterated with Wylie transliteration as rtsa mda', and the spelling "Zanda" is an approximation of the modern Tibetan pronunciation.

土林 literally does translate to "Earth (as in soil, dirt) Forest", but refers to any "forest of rock formations". Other examples include the one in Yuanmou, Yunnan.