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云南宜良的九乡有丰富的溶洞群，九乡的溶洞群发育于距今六亿年以前古老的震荡浅海沉积的灰白色含硅质条带的白云岩中，以硬、脆、碎的物理属性而著称。
这是三角洞入口，可以看到三角洞的入口由一个不大的洞口和两个巨大的天坑组成，看上去象一个三角鼎，或许这也就是三角洞名称的由来。
三角洞是一个没有开发的溶洞，进洞溯溪而上洞内空濶、幽深、平坦，洞内平均高度进十米，洞内窄的地方最少也有十米，宽的地方数十米，洞内有一条早年修建的简易道路，据说是四十年前备战时修建的。
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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.
