Comment: That is current law

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In reply to comment: No you don't... (see in situ)

That is current law

If someone else uses the land, and you don't defend your property right, you lose access to it. For instance, if your neighbor builds a water trough on your property, uses it for 7 years without you complaining, he can keep you from tearing it down, he now has an easement on your property. So yes, you do have to assert your property rights. If you abandon a house, car, etc. you lose your property rights.

Of course if the land is public, it creates a whole different set of guidelines.