Iwahig Firefly Watching is an eco-tour near Puerto Princesa where you can see these flickering insects up close in their natural habitat. Also called lightning bugs, fireflies are an incredible sight, as their trails create the illusion of lightning raining down from their tree and mangrove habitats that line the banks of the Sicsican and Iwahig Rivers.

About 17 KM from the city of Puerto Princesa, the watching site opens at 6 in the evening when fireflies are visible. The locals of Barangay Iwahig rehabilitates the area as a sustainable tourism initiative.