The longest lava tube caves of Southeast Asia - Tan Phu and Krong No Volcanic in southern Vietnam

South Vietnam, C7 Cave, photo Takeshi Murase

International expeditions in 2013, 2014 to Tan Phu and in 2018 to Krong No contributed to the exploration of the lava tube caves (pyroducts) in southern Vietnam, with C7 Cave (Krong No), resembling the currently longest Pyroduct of SE Asia (1,067 m long). The Krong No Volcanic Geopark strives to become a UNESCO Geopark. This presentation provides a thorough overview about the geosettings, exploration history, cave fauna and the expedition results.

By Michael Laumanns, Speleo Club Berlin, Germany

Section: Cave explorations and expeditions

Oral presentation, 45 minutes


South Vietnam, P8 Cave, photo Takeshi Murase

South Vietnam, C1 Cave, photo Takeshi Murase

Speleo CV Michael Laumanns

My first speleological excursions were made in 1981. From 1984-2009 I was a member of the editorial board of the German Speleological Federation (VdHK) and from 1990-2001 editor of the quarterly magazine of the Federation. President of the Federation between 1994 and 2007.

After a break in federation work between 2007-2010 I became responsible for foreign affairs in the German Speleological Federation in 2011. In 2013 the European Speleological Federation (FSE) at its General Assembly in Casola (Italy) elected me Vice-President of the FSE. I changed to the position of Vice-Secretary of FSE in 2016.

My first full scale international expedition was conducted 1988 in Turkey. Since then I participated in many international expeditions to Africa, the Middle East, Asia, and Latin America.

Since 2001 I am the publisher of the international cave expedition and documentation series “Berliner Höhlenkundliche Berichte”, which is released in English language ( So far 75 expedition reports, country monographs and regional atlases were released.

Numerous presentations at international speleological conferences were made. Over 200 speleological publications were released.

Honda, T. & Tachihara, H. (2015): Vietnam Volcanic Cave Survey. Newsletter of the UIS Commission of Volcanic Caves, 69, p. 11-12.
Honda, T.; Tachihara, H.; La The Phuc; Luong Thi Tuat & Truong Quang Quy (2015): Vietnam Volcanic Cave Survey Project Report. Report to the Vietnamese authorities, 7 p., 9 cave surveys.
Laumanns, M. (2014): Karst and Caves of South Vietnam. Part 2: Provinces of Dong Nai, Lam Dong and Quang Tri. Berliner Höhlenkundliche Berichte, 56, 49 p., many cave surveys; Berlin.
Laumanns, M. (2018): 2018 Cave Mapping Project to Krong No Volcanic Geopark, Dak Nong Province, Southern Vietnam. Newsletter UIS Commission on Volcanic Caves, 72, S. 7-13.
Laumanns, M. (Ed.) (2018): Karst and Caves of South Vietnam. Part 3: The Caves of Krong No Volcanic Geopark (Dak Nong province). Berliner Höhlenkundliche Berichte, 74, 70 S.; Berlin.
Laumanns, M. (2018): Vietnam. Krong No Volcanic Geopark, sud du Vietnam. Spelunca, 151, S. 3-4; Lyon.

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