Marah

And when they came to Marah, they could not drink the water there because it was bitter. (That is why it was named Marah.)

They set out from Marah and came to Elim, where there were twelve springs and seventy palm trees, and they camped there.

They set out from Pi-hahiroth and crossed through the sea, into the wilderness, and they journeyed three days into the Wilderness of Etham and camped at Marah.