In the past, the forests in this area were dense and abundant with wildlife. Therefore, the villagers called it by a terrifying name, “Phee Kheed”, later distorted to be Si Khit, part of Namtok Si Khat National Park which is a limestone mountain; thus causing a beautiful limestone waterfall. And, there are also many mysterious caves located in the steep and complex Nakhon Si Thammarat mountain range. There is a watershed dividing the provinces of Nakhon Si Thammarat and Surat Thani.