underground river tour The Puerto Princesa Subterranean River National Park's (Underground River) main feature is the Cabayugan River which flows in an easterly direction for over eight (8) kilometers under a spectacular massif limestone karts towards the South China Sea. Explore the Underground River, located in the Puerto Princesa Subterranean National Park, on a full-day tour from Puerto Princesa city. The Puerto Princesa Subterranean River National Park (also known as the Puerto Princesa Underground River or PPUR), a UNESCO World Heritage Site, is one of the highlights of the island of Palawan in the Philippines.. Puerto Princesa Underground River Tour is a whole day tour and cannot be a half day tour. You will experience the beauty of stalagmites and stalactites, which took thousands of years to form, whilst also mixing among the thousands of bats that inhabit the cave. The Puerto Princesa underground river tour lasts approximately 45 minutes and takes you into the first 1.5 kilometres of the Underground River cave. Waiting time for slots can either be from 1 to 2 hours. From Puerto Princesa to Sabang, it takes approximately 2 hours travel time. Provided round-trip transportation means you can focus on the scenery of Ulugan Bay and the karst mountains on the journey, instead of worrying about directions and navigation. Upon arrival at Sabang, the Tour Guide will secure your party’s slot from the Underground River Authorities Office. Puerto Princesa, Palawan — Get ready to explore the hidden treasures within the pitch dark depths of Puerto Princesa Underground River. This Puerto Princesa Underground River tour do it yourself guide will assist you in making the most out of your trip without having to join an organised tour. This boat trip is open for anyone who wants to explore the spectacular limestone landscape of Palawan’s prized attraction.