They were departed from Rephidim. See the comment on Exodus 17:1, and compare Numbers 33:15. There Israel en-camped before the mountain. The bulk of the tents were no doubt pitched in the plain, Er-Rahah; but this may not have sufficed, and some may have been located in the Wady-ed-Deir, north-east of the Ras Sufsafeh, and others in the Seil-Leja to the west. The Ras Sufsafeh is visible from both these valleys.
HOMILETICS