karst
noun [ C or U ] geology specialized uk/kɑːst/ us/kɑːrst/
喀斯特区，岩溶区
an area of land formed of rock such as limestone that is worn away by water to make caves and other formations
Some of the rocky karsts contain sea caves and hidden lagoons. 一些喀斯特区包含有海蚀洞穴和隐藏的泻湖。
a karst landscape 喀斯特地貌