343:
22:
367:
355:
379:
110:
321:
Skylight III is 690 m from the outlet. It is funnel-shaped, with a top diameter of 75 metres (246 ft), and a diameter at the water level of 43 metres (141 ft). The water depth is as much as 22 metres (72 ft) with an extra 10 metres (33 ft) of sediment. In 2008, explorers found
279:
The seven skylights of the cave are designated
Skylight I - Skylight VII. Skylights I - IV extend westward from the entrance of the cave. Sanmenhai is delimited by Skylight III, which divides the 2.4 kilometres (1.5 mi) underground river into southeast and northwest sections. The southeast
303:
Skylight I is the biggest among the seven skylights. It is roughly circular in shape, with walls that are covered in vegetation. The diameter of the opening is 107 metres (351 ft) in the east–west direction and 98 metres (322 ft) in the north–south direction, with a depth of 72 metres
294:
landform. In an area of less than 1 square kilometre (250 acres), in encompasses peaks, sinkholes, natural bridges, and karst lakes. skylight in sanmenhai is also called karst window(tiankeng) by
Chinese, it is sinkhole-like formation, but differ from sinkhole
283:
Only three of the seven skylights are accessible by boat on the underground river: Skylights I, II, and III. Skylights IV and V are accessible by diving through the river a distance of 50 metres (160 ft) and 70 metres (230 ft), respectively.
330:
Skylight IV is also funnel-shaped, with top dimensions of 30 by 20 metres (98 ft × 66 ft) and water as deep as 70 metres (230 ft). The total height of this skylight (including the depth of the water) is 118 metres (387 ft).
304:(236 ft). There are four routes to Skylight I: the upper and lower reaches of the Poxin River; Gandong cave in east and south; and a water cave from underground. In 2009, a diving exploration found that there is no cave channel in underground.
312:
Skylight II is an oval measuring 85 by 60 metres (279 ft × 197 ft). The bottom of the skylight is half-covered by water, at a depth of 19 metres (62 ft) below the rim. Some plants grow horizontally on the wall of
Skylight II.
51:
342:
193:
91:
131:
174:
67:
146:
43:
366:
127:
354:
120:
47:
422:
287:
The Poxin underground river undergoes daily tidal fluctuations, rising by 20 centimetres (7.9 in) at night.
153:
260:
280:
portion is accessible by tourists, and extends 0.7 kilometres (0.43 mi) from the outlet to
Skylight III.
160:
32:
378:
36:
142:
224:. The cave is unique in that it features seven skylights that mimic the layout of the constellation
210:
60:
264:
71:
291:
56:
167:
416:
109:
225:
322:
that there was an underwater cave connecting
Skylight III with Skylight IV.
268:
217:
213:
221:
103:
15:
402:
54:
and tools are available to assist in formatting, such as
134:. Unsourced material may be challenged and removed.
8:
259:Sanmenhai is located in Poxin, a village in
35:, which are uninformative and vulnerable to
50:and maintains a consistent citation style.
194:Learn how and when to remove this message
92:Learn how and when to remove this message
395:
338:
7:
132:adding citations to reliable sources
42:Please consider converting them to
14:
241:three doors accessible to the sea
377:
365:
353:
341:
263:. It is an outlet of the Poxin
108:
20:
119:needs additional citations for
46:to ensure the article remains
1:
243:. The cave is also known as
239:translates into English as
439:
267:, which formed during the
261:Fengshan County, Guangxi
249:cave that produces water
403:http://leyefengshan.cn/
290:Sanmenhai is a typical
348:Outlet of Poxin river
255:Location and geology
128:improve this article
228:(the Big Dipper).
265:underground river
209:is a cave in the
204:
203:
196:
178:
102:
101:
94:
52:Several templates
430:
423:Caves of Guangxi
405:
400:
381:
369:
357:
345:
199:
192:
188:
185:
179:
177:
136:
112:
104:
97:
90:
86:
83:
77:
75:
64:
24:
23:
16:
438:
437:
433:
432:
431:
429:
428:
427:
413:
412:
409:
408:
401:
397:
392:
385:
382:
373:
370:
361:
358:
349:
346:
337:
328:
319:
310:
301:
277:
257:
234:
200:
189:
183:
180:
137:
135:
125:
113:
98:
87:
81:
78:
66:
55:
41:
25:
21:
12:
11:
5:
436:
434:
426:
425:
415:
414:
407:
406:
394:
393:
391:
388:
387:
386:
383:
376:
374:
371:
364:
362:
359:
352:
350:
347:
340:
336:
333:
327:
324:
318:
315:
309:
306:
300:
297:
276:
273:
256:
253:
233:
230:
202:
201:
116:
114:
107:
100:
99:
44:full citations
28:
26:
19:
13:
10:
9:
6:
4:
3:
2:
435:
424:
421:
420:
418:
411:
404:
399:
396:
389:
380:
375:
368:
363:
356:
351:
344:
339:
334:
332:
325:
323:
316:
314:
307:
305:
298:
296:
293:
288:
285:
281:
274:
272:
270:
266:
262:
254:
252:
250:
246:
242:
238:
231:
229:
227:
223:
219:
215:
212:
211:Leye-Fengshan
208:
198:
195:
187:
176:
173:
169:
166:
162:
159:
155:
152:
148:
145: –
144:
140:
139:Find sources:
133:
129:
123:
122:
117:This article
115:
111:
106:
105:
96:
93:
85:
73:
72:documentation
69:
62:
61:documentation
58:
53:
49:
45:
40:
38:
34:
29:This article
27:
18:
17:
410:
398:
384:Skylight III
329:
320:
317:Skylight III
311:
302:
289:
286:
282:
278:
258:
248:
245:Shuiyuandong
244:
240:
236:
235:
206:
205:
190:
181:
171:
164:
157:
150:
138:
126:Please help
121:verification
118:
88:
79:
68:Citation bot
30:
372:Skylight II
326:Skylight IV
308:Skylight II
275:Exploration
184:August 2012
143:"Sanmenhai"
82:August 2022
390:References
360:Skylight I
299:Skylight I
247:, meaning
226:Ursa Major
154:newspapers
48:verifiable
237:Sanmenhai
232:Etymology
207:Sanmenhai
33:bare URLs
417:Category
271:period.
37:link rot
335:Gallery
269:Permian
218:Guangxi
214:geopark
168:scholar
170:
163:
156:
149:
141:
57:reFill
292:karst
222:China
175:JSTOR
161:books
31:uses
147:news
65:and
216:in
130:by
419::
251:.
220:,
197:)
191:(
186:)
182:(
172:·
165:·
158:·
151:·
124:.
95:)
89:(
84:)
80:(
76:.
74:)
70:(
63:)
59:(
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
