A suggested possible naturalistic explanation of the biblical "devouring fire" is that Sinai could have been an erupting volcano; this has been suggested by Charles Beke, Sigmund Freud, and Immanuel Velikovsky, among others. This possibility would exclude all the peaks on the Sinai peninsula and Seir, but would make a number of locations in north western Saudi Arabia reasonable candidates. In 1873, Charles Beke proposed Jebel Baggir which he called the "Jabal al-Nour" (meaning "mountain of light"), a volcanic mountain at the northern end of the Gulf of Aqaba, with Horeb being argued to be a different mountain - the nearby Jebel Ertowa. Beke's suggestion has not found as much scholarly support as the candidature of Hala-'l Badr; the equation of Sinai with Hala-'l Badr has been advocated by Alois Musil in the early 20th century, Jean Koenig in 1971, and Colin Humphreys in 2003, among others.