Land ownership has been the subject of a lot of formal and informal legal hassle since agriculture was invented. And even prior to that, I'm sure tribes had hunting and gathering territories ("I fish on this side, you fish on that side, nobody fish in the middle.")

Heck, many animals are territorial, and will lay claim to areas and defend them against others.

When survival demands that you live off the land, land becomes an issue.

Agriculture brings this to a sharper point, since it requires far more investment of human time and labor prior to the reward than hunting or gathering does. Agriculture is the primal example of delayed gratification, with almost a year between plantings and reapings.

A sense of property would be inevitable, and rules, traditions, and eventually laws would rise to meet this need.

There are a thousand ways of dealing with property issues. Land has been owned collectively and individually in many ways through history, but the common factor is that the user of the land has to know it's there for his use or his community's use, and that the rules will be sure it's still there for his use next year.

Without property rights of some kind, civilization becomes impossible.