Grottes et karsts de Chine
Sur les traces de Xu Xiake

4.2. Boniukeng (length: 1,386 m; depth: -186 m)
This cave starts at the base of a large collapse doline of 80 × 50 m in size and 80 m of depth. A relatively large passage continues in both directions, following the underground stream (lower part with passages 2–20 m high and 2–5 m wide) and against the stream (upper part with passages 2–30 m high and 2–5 m wide). The lower part is technically difficult with small but deep lakes and steep steps up to 17 m high. The passage continues towards the unknown cave space.
The upper part consists of a passage (lately branching) of decreasing size from 15 × 30 m up to 1 × 8 m (width × height). Several chimneys were found there up to 70 m high. A fossil level with some artificial artifacts was found in this part of the cave.

Zdenek Motycka, Michal Filippi, Zhang Yuanhai (2017)
Cave Exploration In Xiaonanhai Karst Area, Shaanxi Province, China p.330-333
Moore K., White S. (Eds), 2017. Proceedings of the 17th International Congress of Speleology (Ed. 2), July 23–29, Sydney, NSW Australia
Volume 1, Australian Speleological Federation Inc. Sydney. Vol 1.
Analyse :
Description de la zone et des principales cavité explorées durant les deux expéditions (2016) Shaanxi project organisé par Czech Speleological Society, Institute of Geology of the Czech Academy of Sciences, Institute of Karst Geology, Chinese Academy of Geological Sciences. 1 carte, 5 topos, 4 photos.7 km of new caves were explored and surveyed. Guanyindong (3024 ; -445), Boniukeng (1386 ;187), Xiaoxuidong (777) and Diao Dong (762 ; 45 ).

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