Fratel Dam

Fratel Dam is a concrete gravity dam on the Tagus, where the river forms the border line between the districts of Castelo Branco and Portalegre. It is located in the municipality Vila Velha de Ródão, in Castelo Branco District, Portugal.

The dam was completed in 1973. It is owned by Companhia Portuguesa de Produção de Electricidade. The construction of the dam meant the flooding of most of the tens of thousands of petroglyphs found in the Tagus valley rock art area.

Source: Wikipedia