Thomas Wright, Early Christianity in Arabia (1855)
“ The Arabian peninsula is considered by Niebuhr as an immense pile of mountains, encircled with a belt of flat, arid, sandy ground, which extends from Suez around the whole peninsula to the mouth of the Euphrates, and is continued on the north by the province of Petra and the deserts of Syria. The principal mountain chain runs nearly parallel with the Red Sea, at a distance of from thirty to eighty miles, increasing in elevation towards the south. ”
