Kellia

Kellia, referred to as "the innermost desert", was a 4th-century Egyptian Christian monastic community spread out over many square kilometers in the Nitrian Desert about 65 km south of Alexandria. It was one of three centers of monastic activity in the region, along with Nitria and Scetis. It is called al-Muna in Arabic and was inhabited until the 9th century. Only archaeological sites remain there today.

Source: Wikipedia