“Life, liberty, and property do not exist because men have made laws. On the contrary, it was the fact that life, liberty, and property existed beforehand that caused men to make laws in the first place.”
Only as much property as one can immediately protect is "natural". If someone claims to to own ridiculous amount of land, there'll be disputes to that claim.
While this is somewhat true, it's a natural law that in the absence of any established cultural rules on property, societies tend toward a known set of such property rules. If you stake a claim on unused/undeveloped land, and start to work it as such, some other people will respect that claim; but property isn't about what you can defend, it's about agreement. For example, if there were no laws on the matter, and you moved onto the abandoned farmland a few miles from me. I wasn't working that land and didn't claim it, because I couldn't do anything with it anyway. So you start working it, and I respect your claim on that land and the products of your work. Not because I must, but because by respecting your claim I can expect the same from you, you will respect my claim on the portion that I have been working. This is how society really works, but on a much larger scale. A land deed is simply a document that states that a government, acting on behalf of society at large, is honoring a claim of ownership.
You can watch this very natural set of property rules in their most basic form by watch toddlers in a playroom. Whoever has a particular toy and is presently playing with it 'owns' it for the moment, and any attempt by others to take it away will result in not just resistance, but cries for help. Yet, if the first child gets up and walks away from the toy, another could come in and take that toy and stake his new claim, and
often expect it to be respected by the other kids and the adults alike. After all, it does come
naturally.
EDIT: And you can tell that the claim of ownership is known by the kid who takes toys from others, even if he doesn't respect it, because he never calls for help to take away the toy and doesn't expect the adults to help him do so; and when the child who feels that he has been wronged squeals for intervention he does expect to receive aid, while the attacker will often lie about the facts or simply look quilty. Because in truth, he knows he was wrong.