Numbers 33:8

Christian Standard Bible

They traveled from Pi-hahiroth  and crossed through the middle of the sea  into the wilderness. They took a three-day journey into the Wilderness of Etham and camped at Marah.

Cross References

Exodus 14:2

“Tell the Israelites to turn back and camp in front of Pi-hahiroth, between Migdol and the sea; you must camp in front of Baal-zephon, facing it by the sea.