The Bayano Caves are three caves locat­ed on the south side of Lago Bayano in Panamá Province, Pana­ma. The first, largest cave is approx­i­mate­ly two kilo­me­ters long. The Río Seco runs through the cave, allow­ing boats to go part­way inside the cav­ern. Though the cave receives some vis­i­tors, it is not lit.