English: Xiaozhai "Tiankeng" (collapse of a river cave roof), seen from the southern rim; provincial-level municipality of Chongqing (before 1997 part of Province Sichuan).
A new tourist road off Fengjie (at Yangtze River) to Xiaozhai (Little Village), leads to the world's finest tiankeng. Xiaozhai Tiankeng is 511 m deep from the lowest point of the vertical wall's rim. Its upper section is 600 m in diameter. The lower section is 300 m across, with vertical cliffs over 300 m high round its entire perimeter, except where a steep fan of collapse debris is banked against its northern wall. The tiankeng now has stone steps zigzaging down the debris fan to the floor.