Jamieson, Fausset and Brown on Genesis 19:27

27. Abraham gat up early in the morning, &c.--Abraham was at this time in Mamre, near Hebron, and a traveller last year verified the truth of this passage. "From the height which overlooks Hebron, where the patriarch stood, the observer at the present day has an extensive view spread out before him towards the Dead Sea. A cloud of smoke rising from the plain would be visible to a person at Hebron now, and could have been, therefore, to Abraham as he looked toward Sodom on the morning of its destruction by God" [Hackett]. It must have been an awful sight, and is frequently alluded to in Scripture (De 29:23; Is 13:19; Jude 7). "The plain which is now covered by the Salt or Dead Sea shows in the great difference of level between the bottoms of the northern and southern ends of the lake--the latter being thirteen feet and the former thirteen hundred--that the southern end was of recent formation, and submerged at the time of the fall of the cities" [Lynch].