The territory of Sin — a place name, not the term for moral malady — that Israel transversed after leaving Mitsraim (Egypt) was a very large place. It’s in the area where Mt. Sinai is located.
Yet, Yisra’el did sin at Rephadim, so it was called Massah and Meribah. But God still gave the people water from the rock — “living water” preceded law at Sinai — and defeated Amalek.
This is a difficult, laborious chapter. There are lots of hard-to-pronounce names — 40, 42 or 43 depending on the count. Yet the name of each encampment carries important teachings from what happened at each site and the meaning of the names themselves.
The people of Israel had cried out from the burden of overwork but they didn’t want God to remove them from Goshen forever. Yet, that’s what God did in a miraculous way. As we have reached the fifth week leading up to Sinai, the people are becoming very homesick for Egypt as they are traveling further and further from Egypt. God brings the people of Israel to the wilderness of Sin where they murmur against God for the second time. God responds by making a surprising provision and another test of their willingness to listen and obey God.