The geological significance of spelology is the underground caverns that have required about 60 million years to form, consisting of coral sand. In the upper part of the National Park, about 400 meters high there is a panoramic view of the river Tempisque lowlands, and the Gulf of Nicoya and some of its islands. Terciopelo Cave: Formation as much as the body, because it emits different tones when struck gently walls, has a total depth of 62 meters. The descent into the cave is about 45 minutes to 1 hour maximum and is done with special equipment for caving. Access is made with a initial vertical descent of 17 meters. And then continue all the way down an inclined plane 35 ° to the east. Other decorations are Amazing “lions” head and Curtains” Cuevita Cave: This cave is only for children between 4 years to 12 years old. The deep of this one is around 2 meters, you could see great formations of the stalagmites and stalactites on a beaty wall.