The Puerto Princesa Underground River tour involves riding a paddle boat that will take you to the river's entrance. From there, you’ll be boarding a smaller boat to cruise along a 4.3-km portion of the river, which will give you a view of the river’s pristine waters, stunning limestone cliffs, and magnificent cave formations.

Inside the caves, you’ll see interesting stalactite and stalagmite rock formations, as well as birds, bats, and reptiles that live in the cave. Occasionally, you’ll see fishes and crabs within the river system, too.