They left Pi Hahiroth and passed through the sea into the desert, and when they had traveled for three days in the Desert of Etham, they camped at Marah.
NIV
And they journeyed from before Pi-hahiroth and passed through the midst of the [Red] Sea into the wilderness; and they went a three days' journey in the Wilderness of Etham and encamped at Marah.
AMP
And they departed from before Pihahiroth, and passed through the midst of the sea into the wilderness, and went three days' journey in the wilderness of Etham, and pitched in Marah.
KJV