Flooded grave in El Salto, Mexico. El Salto is a 17,000-acre reservoir in the foothills of the Sierra Madre in mainland Mexico. Officials decided to create the lake in 1983, building a dam and allowing the Rio Elota to flood an area covering five villages, including their cemeteries. Two cemeteries remained near the surface. Some of the headstones date to the early 1800s. Sometimes, when the water is low, parts of the monuments can be seen above the surface(as shown above). Other times, they are eerily visible below.