What does Numbers 33:8 mean?

They left Pi-hahiroth, crossed through the sea into the desert, and after traveling for three days in the Wilderness of Etham, they set up camp at Marah. Numbers 33:8 - Modern Text Bible

(This verse describes the Israelites' journey right after escaping Egypt, crossing the sea, and entering the desert. Marah is where they first faced bitter water.)