And they took their journey out of the wilderness of Sin,.... According to the account in Exodus, this was after they had the manna given them, see Exo 17:1.

and encamped at Dophkah; twelve miles from the wilderness of Sin; and of this, and the next encampment, no mention is made in Exodus.

encamped by the Red Sea--The road from Wady Ghurundel leads into the interior, in consequence of a high continuous ridge which excludes all view of the sea. At the mouth of Wady-et-Tayibeh, after about three days' march, it opens again on a plain along the margin of the Red Sea. The minute accuracy of the Scripture narrative, in corresponding so exactly with the geographical features of this region, is remarkably shown in describing the Israelites as proceeding by the only practicable route that could be taken. This plain, where they encamped, was the Desert of Sin (see on Exo 16:1).