Statistics about the surveyed areas

Total surveyed development (m) for all explored areas during 7 expeditions

		Area	1993	1995	1997	2000	2001	2002	2004	2006	Total
Son La	1	Khau Pha	2.352								2.352
	2	Nam Khum	6.510	1.830							8.340
	3	Bom Bay	1.160	154		484					1.798
	4	Ban Thong	716	450							1.166
	5	Ban Bon		2.456							2.456
Tuan Chau	6	Ban Phe		2.104		477					2.581
	7	Mai Son		273							273
	8	Thuan Chau			286						286
	9	Phong La		456	1.641						2.097
Tuan Giao	10	Pu Nhung			1.045						1.045
	11	Chieng Ban			2.455						2.455
Tua Chua	12	Sang  Nhe			5.485	129	916				6.530
	13	Tua Thang			709						709
	14	Tua Phinh			1.476	399	692	430			2.997
	26	Sin Chai					0	877			877
Quynh Nhai	15	Huoi So			2.340						2.340
	16	Quynh Nhai			775						775
Muong La	17	Muong Trai			314						314
Tam Duong	18	Sung Phai				1.392					1.392
	19	Lan Nhi Thang				2.336	1.521				3.857
	20	Tam Duong				3.132	561				3.693
	21	Ban Hon				2.596					2.596
	22	Binh Lu				500					500
	23	Nung Nang					1.921	104			2.025
	24	Nam Loong					1.824	1.203			3.027
	25	Chieu Sai Pin					932	1.781			2.713
	27	Ban Giang					403				403
	28	Muong Xo						0
Sin Ho	29	Phan Xui Lin						486			486
	30	Ta Ngao						475			475
Tan Lac	31	Tan Lac
Ba Be	32	Ba Be
Dong Van	33	Dong Van
	34	Pho Bang
Meo Vac	35	Meo Vac N
	36	Meo Vac E
	37	Meo Vac W
Yen Minh	38	Yen Minh N
Moc Chau	xx	Moc Chau			501						501
	xy	Nam Phe					664				664
		Total	10.738	7.723	17.027	11.445	9.434	5.356			61.723

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Longest caves in Vietnam, sorted by length (m). Updated 2006

Caves surveyed during Belgian – Vietnamese expeditions 1993-2006  Longest Vietnamese Caves, Sorted by length
	Length (m)	Cave	Depth (m)	Reference	Expe Year
1	2902	Noong Khat	-68	Ngoc Long	06
2	2080	Sin Cau 4 & 5	-47	TD4	00/01
3	2015	Ta Chinh	-402	TP1	97/00/01
4	1951	Pa Nha 1	18	SN10	97/01
5	1923	Hang Ong	-367	PB1	04/06
6	1882	Cong Nuoc	-600	CS1	01/02
7	1880	Hang Ran	-87	NK3	93
8	1738	Ban Piac	-38	BA3	04
9	1684	Dong Pao 1	65	BH1	00
10	1551	Thi Doi	21	NK8	93
11	1435	Hang Doi	47	KP1	93
12	1382	Chieng Ban 4	0	CB4	97
13	1323	Ban Hin	-28	NK5	93
14	1305	Hang Doi Nuoc	-290	NT1	00/01
15	1282	Suoi Thau	-102	SP1	00

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Deepest caves, sorted by depth (m). Updated 2006

(in 2002 Cong Nuoc became the deepest cave in Vietnam and Southeast Asia with -600m)

Belgian – Vietnamese expeditions 1993-2006. Deepest Vietnamese caves surveyed, Sorted by depth
	Depth (m)	Cave Name	Length (m)	Reference	Expe
1	-600	Cong Nuoc	1882	CS1	01/02
2	-402	Ta Chinh	2015	TP1	97/00/01
3	-367	Hang Ong	1923	PB1	04/06
4	-340	Xa Lung 2	700	DV2	04
5	-306	Lung Chinh	409	MVw1	04/06
6	-301	Yen Chow Do	699	CS3	02
7	-296	Sung Khe 4	1030	Lung Chinh	06
8	-291	Pa Ca 1	475	PB3	04
9	-290	Hang Doi Nuoc	1305	NT1	00/01
10	-286	Si Leng Chai	1162	NT2	00
11	-254	Cang Ti 2	376	SC2	01/02
12	-193	Sin Chai 1	342	SC5	02
13	-192	Sung Khe 2	389	Lung Chinh	06
14	-178	Xa Lung 1	262	DV1	04
15	-168	Queen’s Cave	407	BT2	93

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Deepest Caves in Vietnam – All Expeditions (not only ours), updated  January 2006

Deepest Caves of Vietnam – All expeditions
Rank	Province	Area/Village	Cave Name	Length	Depth	Year Explored	Expedition
1	Lai Chau	Chieu Sai Pin	Cong Nuoc	1882	-600	01/02	Belgian
2	Ha Giang	Dong Van	Basta Nuddles		-528	96	Italian
3	Lai Chau	Tua Phinh	Ta Chinh	2015	-402	97/00/01	Belgian
4	Ha Giang	Pho Bang	Hang Ong	1923	-367	04/06	Belgian
5	Ha Giang	Dong Van	Xa Lung 2	700	-340	04	Belgian
6	Ha Giang	Meo Vac West	Lung Chinh	409	-306	04/06	Belgian
7	Lai Chau	Chieu Sai Pin	Yen Chow Do	699	-301	02	Belgian
8	Cao Bang	Thong Nuong	Mu Cai Shaft	500	-300	95	Italian
9	Ha Giang	Meo Vac	Sung Khe 4	1030	-296	06	Belgian
10	Ha Giang	Pho Bang	Pa Ca 1	475	-291	04	Belgian
11	Lai Chau	Lan Nhi Thang	Hang Doi Nuoc	1305	-290	00/01	Belgian
12	Cao Bang	Thieng Ngoa	Cam Thon		-288	99/01	British
13	Lai Chau	Lan Nhi Thang	Si Leng Chai	1162	-286	00	Belgian
14	Lai Chau	Sin Chai	Cang Ti 2	376	-254	01/02	Belgian
15	Lai Chau	Sin Chai	Sin Chai 1	342	-193	02	Belgian
16	Ha Giang	Meo Vac	Sung Khe 2	389	-192	06	Belgian
17	Cao Bang	Thong Nuong	Bang Ngam – Rang Khieo	3600	-180	95	French/Italian
18	Ha Giang	Dong Van	Xa Lung 1	262	-178	04	Belgian
19	Son La	Ban Thong	Queen’s Cave	407	-168	93	Belgian
20	Son La	Chieng Ve	Hang Ong Trinh	295	-165	94/98	British/French/Italian

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Longest Caves of Vietnam (Thanks to Howard Limbert)

Rank	Cave Name	Province	Length	Year Explored	Expedition
1	Hang Khe Rhy	Quang Binh	18920	1997/1999	British
2	Hang Vom	Quang Binh	15050	1992/1994	British
3	Hang Co Ban	Son La	8500	1998	French/Italian
4	Hang Phong Nha	Quang Binh	7729	1990/1992	British
5	Nguom Ban San	Lang Son	5416	2001/2003	British
6	Nguom Sap	Cao Bang	5379	1997/1999	British
7	Hang Toi	Quang Binh	5258	1990/1992	British
8	Hang Duat	Quang Binh	3927	1994	British
9	Hang Lanh	Quang Binh	3753	2001	British
10	Ban Ngam	Cao Bang	3600	1995	French/Italian
11	Hang Thung	Quang Binh	3500	1994	British
12	Nguom Nam Lao	Cao Bang	3360	2001	British
13	Ki Lu	Cao Bang	3353	2003	British
14	Hang Ca-Be	Lang Son	3342	1992	British
15	Nguom Pac Bo	Cao Bang	3248	1997	British
16	Hang Over	Quang Binh	3244	1997	British
17	Pac Lung	Cao Bang	3109	2001	British
18	Bo Luong	Lang Son	3094	2003	British
19	Hang Nuoc	Hoa Binh	3075	2003	British
20	Bo Nhon	Lang Son	3057	2003	British
21	Na Lon	Ha Son Binh	3000	1990	British