Similar formations were found on shore and within Tuosu Lake, also transliterated as Lake Toson, which lies 80 meters (260 feet) from the mouth of the largest cave. On the beach of the lake, about 40 meters (130 feet) from the mouth of the largest cave, apparently flat-lying, hollow, pipe-like features were found, reddish-brown, and ranging in diameter from 2 to 4.5 cm (0.8 to 1.8 inch) and have an east–west orientation.
Similar formations have been found both on the shore and within Tuosu Lake, which is located approximately 80 meters (260 feet) from the mouth of the largest cave. Near the lake's entrance, about 40 meters (130 feet) away, flat, hollow pipe-like structures were discovered, reddish-brown in color and varying in diameter from 2 to 4.5 cm (0.8 to 1.8 inches), with an east-west orientation.