Shijia Village in Hukeng Township, part of the "Great Wall of Tulou". Nan'an  Lou, one of the  tulous on the "central square" of that village. Nan'an Lou has an unusual plan, in the shape of the letter D, rather than a circle or a square. This makes it easy to identify it from aerial photos.
<a href="//commons.wikimedia.org/wiki/User:Vmenkov" title="User:Vmenkov">User:Vmenkov</a>
CC BY 2.0
<span class="int-own-work" lang="en">Own work</span>