Cueva del Arco on Rio Tanama in Puerto RicoCueva del Arco is a stunning view and is made up of two parts. You have both the extremely large arch cut and formed out of the rock by the Tanama River. The thing you can not see in the video is the second part of Cueva del Arco and that is the overhead cave that is found just above the arch. When hiking overhead you can see down into the bottom of the arch. If you slipped you would fall about 100 feet to a nearly certain death. From down at the river you can look up into the arch and see the cave enters at the very top of the arch near the middle of the way through.