Wadi El Natrun
The word "natron" has been in use in many languages throughout modern times (in the forms of "anatron","natrum" and "natron") and originated (like Spanish, French and English "natron" as well as 'sodium') via Arabic "naṭrūn" (or "anatrūn"; cf. the Lower Egyptian “Natrontal” Wadi El Natrun, where a mixture of sodium carbonate and sodium hydrogen carbonate for the dehydration of mummies was used ) from Greek "nítron (νίτρον)" (Herodotus; Attic "lítron (λίτρον)"), which can be traced back to ancient Egyptian "ntr". The Greek "nítron" (soda, soda, saltpeter) was also used in Latin "(sal) nitrum" and in German "Salniter" (the source of "Nitrogen", "Nitrat" etc.).