Yunnan Route 214 at 235 km mark, as it passes by a small quarry on its winding approach to  the valley of Red River (aka Yuanjiang) from the north. In this area you can already the river (actually, the Nansha Reservoir now), although it's not in the picture.  Potou Township, Jianshui County, Yunnan.
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<span class="int-own-work" lang="en">Own work</span>