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云南省宜良县九乡镇有天然大型溶洞群，三角洞是其中一个未开发的溶洞，溶洞口非常独特，表现为三个入口，因此被人称为三角洞，三角洞的入口很雄伟似溶洞也似天坑，是值得一去的地方，这里有一些开发后又被遗弃的人工痕迹，基本已被水毁，自行进洞请注意安全，洞内没有照明或保障设施，这张全景片是在全黑的环境中用闪光灯拍摄的，感谢我的朋友“飞扬”和“喵喵”按了上百下闪光灯一同完成了这张漆黑环境下的溶洞内全景图。
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Yunnan Province in southwest China border, the provincial capital Kunming. Warring States period, this is the Dian tribe fowl. Yunnan, namely, "Caiyunzhinan"and the other argument is that because in the "Yunling of the South " is named. The total area of about 39 million square kilometers, accounting for 4.11% of total land area, the provincial administrative regions in the country ranked No. 8 in the area. The total population of 45,130,000 (2008), accounting for 3.36% of the population, the population ranked 13th. And Yunnan provinces adjacent to Sichuan, Guizhou, Guangxi, Tibet, Yunnan Province, three neighboring countries of Myanmar, Laos and Vietnam. Tropic of Cancer crosses from the southern province.
