Thongpin cave is a small cave that is about 100 meters from the beach of Tongsai. In the past, there was a boat trip to go to the farm near Khanom, Nakhon Si Thammarat. The area is adjacent to Nang kam. When a rowing boat back home, a woman named “Thongpin” drowned and died in a gutter near the mouth of this cave. The villagers called this cave "Thongpin Cave" since then.