The Underground River is the sight most visitors to Palawan want to see. It’s very crowded, but the longest underground river in the world! The jumping-off point for the river is Sabang, more than two hours north of Puerto Princesa by road. We do recommend to get permit for Underground River in Puerto Princesa, to take a bus to Sabang, to sleep at Dayunan Tourist Inn close to the pier and to catch the first boat in the morning to be at Underground River before the tourists arrive! After visiting that amazing UNESCO World Heritage Site, energetic souls should return to Sabang on foot over the 5 km – long Jungle Trail….