Reservoir re-housed, historical artifacts moved or rare environments relocated. Examples include the temples of Abu Simbel (which were moved before the construction of the Aswan Dam to create Lake Nasser from the Nile in Egypt), the relocation of the village of Capel Celyn during the construction of Llyn Celyn, and the relocation of Borgo San Pietro of Petrella Salto during the construction of Lake Salto. Construction of a reservoir in a valley will usually need the river to be diverted during part of the build, often through a temporary tunnel or by-pass channel. In hilly regions, reservoirs are often constructed by
Ramesses II As well as the temples of Abu Simbel, Ramesses left other monuments to himself in Nubia. His early campaigns are illustrated on the walls of Beit el-Wali (now relocated to New Kalabsha). Other temples dedicated to Ramesses are Derr and Gerf Hussein (also relocated to New Kalabsha). The tomb of the most important consort of Ramesses was discovered by Ernesto Schiaparelli in 1904. Although it had been looted in ancient times, the tomb of Nefertari is extremely important, because its magnificent wall painting decoration is regarded as one of the greatest achievements of ancient Egyptian art. A flight of steps