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
Environmental issues in Egypt like Abu Simbel. Abu Simbel is a monument to Ramses II built of sandstone, and comprises two temples to gods of the Ancient Egyptian pantheon. Emergency archaeological digs and projects were conducted to retrieve as much as possible from these sites that have been so well preserved by the arid climate. Abu Simbel itself was cut into pieces and moved to a cliff face above the new water level of the Nile above the dam. It now stands 60 meters above where it originally stood, on a cliff overlooking Lake Nasser. Another well-known monument moved during the rescue mission was