The area is also interspersed with mudstone strata containing large amounts of natural gas that forces mud out of the ground in " mud volcanoes . 此外地质多为泥岩，加上地层蕴藏大量天然气，可持续不断喷出泥浆，亦有泥火山之称。
2.
Another place that should be mentioned is the liyushan mud volcano located on the boundary between wantan and hsinyuan . it spurts out bubbling hot mud at irregular intervals . each such burst of volcanic activity usually lasts four to eight hours 另外值得一提的景点，是位于万丹与新园交界的鲤鱼山泥火山，会不定时喷发滚热泥浆，通常每次喷发时间为四到八小时。
