is a depression in northern Egypt that is located 23 m (75 ft) below sea level and 38 m (125 ft) below the Nile River level. The valley contains several alkaline lakes, natron-rich salt deposits, salt marshes and freshwater marshes t is one of the three early Christian monastic centers located in the Nitrian Desert of the northwestern Nile Delta. The other two monastic centers are Nitria and Kellia. Scetis, now called Wadi El Natrun, is best known today because its ancient monasteries remain in use, unlike Nitria and Kellia which have only archaeological remains.The desertified valley around Scetis in particular may be called the Desert of Scetis.