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
Abu Simbel temples goddesses Hathor, Isis, Maat, Mut of Asher, Satis and Taweret; in one scene Ramesses is presenting flowers or burning incense. The capitals of the pillars bear the face of the goddess Hathor; this type of column is known as Hathoric. The bas-reliefs in the pillared hall illustrate the deification of the king, the destruction of his enemies in the north and south (in this scenes the king is accompanied by his wife), and the queen making offerings to the goddess Hathor and Mut. The hypostyle hall is followed by a vestibule, access to which is given by three large doors.