And they took their journey from Succoth, and encamped in Etham, in the edge of the wilderness.

Jamieson-Fausset-Brown Bible Commentary

20. encamped in Etham-This place is supposed by the most intelligent travellers to be the modern Ajrud, where is a watering-place, and which is the third stage of the pilgrim-caravans to Mecca. "It is remarkable that either of the different routes eastward from Heliopolis, or southward from Heroopolis, equally admit of Ajrud being Etham. It is twelve miles northwest from Suez, and is literally on the edge of the desert" [Pictorial Bible].

Matthew Henry's Concise Commentary

13:17-20 There were two ways from Egypt to Canaan. One was only a few days' journey; the other was much further about, through the wilderness, and that was the way in which God chose to lead his people Israel. The Egyptians were to be drowned in the Red sea; the Israelites were to be humbled and proved in the wilderness. God's way is the right way, though it seems about. If we think he leads not his people the nearest way, yet we may be sure he leads them the best way, and so it will appear when we come to our journey's end. The Philistines were powerful enemies; it was needful that the Israelites should be prepared for the wars of Canaan, by passing through the difficulties of the wilderness. Thus God proportions his people's trials to their strength, 1Co 10:13. They went up in good order. They went up in five in a rank, some; in five bands, so others, which it seems rather to their faith and hope, that God would bring them to Canaan, in expectation of which they carried these bones with them while in the desert.