Ronald Fritz, Caves in Phong Nha-Ke Bang National Park (TRAVEL 2020)

Phong Nha-Ke Bang National Park, a UNESCO World Heritage Site in Quang Binh Province, Vietnam have a vast network of caves. These photos are from Pygmy cave, considered the fourth largest cave in the world, and Son Doong, the world’s largest cave (the cave illuminated with the headlamps)

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.