How do you know this, do you have a source, Im just curious?
I know back in Australia, unless the law has changed recently, if you move your boundary wall/fence etc onto ajoining land and there are no complaints you can claim it as your own after a period of time. A friend of mine did it by taking over the "right of way" at the rear of his property originally used for night carts. After 5 years? and no complaints he claimed it as his own and noone could stop him.