Phu Pha Phet Cave in Satun province, in south Thailand
it is a large cave,with a deep hollow,spacious inner chamber,and a high ceiling,covering an area of about 50 rai. It was formerly called "Tham Lot","Tham Phet",or "Tham Yao" Later,Tham Phuphaphet(Diamond Mountain Cave) was named after the sparking stalacting and stalagmites inside the cave that look like glistering diamonds in the light.