Egyptian temple Debod, as gifts to nations that had contributed to the preservation effort. Nevertheless, several other temples vanished beneath the lake. Today there are dozens of sites with substantial temple remains, although many more once existed, and none of the major temples in Lower or Middle Egypt are well preserved. Those that are well preserved, such as Karnak, Luxor, and Abu Simbel, draw tourists from around the world and are therefore a key attraction for the Egyptian tourist industry, which is a major sector of the Egyptian economy. Three temple sites—Ancient Thebes with its Necropolis, Memphis and its Necropolis, and the
Abu Simbel summer seldom fall below 20 °C. Winters are mild with highs around 25 °C, when temperatures can sometimes fall below 10 °C at night. Precipitation is so rare here that it is impossible to state a "rainy season" for Abu Simbel. In the past, Abu Simbel was located on the west bank of the Nile between the first and second Cataracts of the Nile. Cataracts are rapids caused by boulders or rock sills; they were only passable with difficulty by Nile ship traffic, especially at baseflow. Today both cataracts near Aswan and Wadi Halfa are covered by Lake Nasser, which