We took a train down to Guilin because that was where we expected to find some incredible “karst” rock formations that are a visual delight, and so it proved. It’s just such a beautiful area geographically speaking. The area is just so unusual and conjecture abounds as to how it was all formed. Materially it appears to be constituted from Carboniferous limestone and therefore the theory postulates that billions of years ago the area was undersea and these deposits  had formed from trillions and trillions of sub surface exoskeletons of marine organisms  in the currents and eddies therein.