The Well of the Spirit, also known as Nam Po Phi Cave, is the deepest and largest crater or crater in Thailand. It is estimated to be two football fields in width, and it is about 200 meters deep. It is a closed cave beneath which there is a dense forest and steep rock formations everywhere with Spectacular stalactites and stalagmites, and the only way to explore them is by climbing over a hundred meters high in the mid-air rope.