Take the route Khao Ngu-Boek Phrai and go on for about 17 kilometres. In the area of Khao Chong Phran, a beautiful cave named “Tham Phra Non” is situated with more than 100 Buddha images and a massive reclining Buddha image which is 9 meters long inside. However, the most famous thing to see at Khao Chong Phran is a giant flock of more than a million bats flying out together of the cave and forming a large black and long line across the sky. This activity lasts for hours every evening after sunset, around 5.30 p.m. In summer, they will fly to the east but in winter they fly to the west.