东兰国家地质公园岩溶地貌发育，形成了大大小小的穿洞。穿洞分布密集，延展方向有序，蔚为壮观。高低错落的溶洞，在流水长时间的侵蚀作用后，形成千姿万态、美轮美奂的穿洞，让人无不惊叹大自然的鬼斧神工。 With the development of karst landform in Donglan National Geopark, many karst caves in all sizes were formed. The caves are densely distributed and extends in an orderly direction, which is really spectacular. After a long time of erosion, the caves in different heights forms various and beautiful karst caves, which makes people can't hold their wonder towards the magic of nature.