Wazzat? -
You have to understand the basis for laws and methods of determining the property actually loaned. It is not uncommon for property line since that basis is the grounds for individual and country boundaries over time.
Every country has different property laws just as they have different languages and interpretations.
It is not uncommon for old surveys to be reviewed and new boundaries determined to properly establish the rights and obligations.
Keep in mind that many original land surveys (section corners to start from) were done by counting the revolutions of a rag tied to a horse drawn wagon and then adjusted using a compass before the cyclic magnetic declination was even thought of.
Property come with both rights and obligations that must be treated and balanced legally. Then, they must be adjusted for the advances of technology to blend the old, new and long established use of the property in good faith. Often, adjacent owners have a old survey blended into an existing situation using surveyors and engineers.
My mother fell into that situation when a new buyer of a lake lot wanted to build a home on someone else property based on an old survey (50 to 100 years old) he had and thought that that was gospel. The adjacent owners knew better, so they had a survey done to determine the property corners and found that about 25 adjacent owners had built and liked in large lots (narrow and deep) and built on what was assumed to be their lot through the years. All the lots were lake shore frontage (big $$$s) and construction was based on at the methods of the time. Everyone found out that they had buildings and driveways that were on a neighbors property.
They just jointly had a new survey done to determine the property lines that fit the situations. - My mother had a road/driveway on one neighbors property, her dock on the other neighbors property and her house too close to one to get a permit for remodeling. This was typical.Everyone hired a surveyor to determine property corners that fit the current use and adjust the common points on the angular curving road to be adjusted for slope difference and magnetic declination over the years and give the county an idea where the road that had to be maintained.
The survey covered about 5,000 feet of shoreline and was unanimously accepted by the county, property owners and the heirs of the current owners.
At least everyone had a new definition that fit what they bought, used and paid taxes on. Fortunately they were within a mile or so of a known steel section corner.
In Jungle's situation, adjacent property owners can jointly accept a later proper determination by a land surveyor to amend a property line location an a correction to the old lines as long as it does not affect others. - It sure makes it easier to put up fences and detrmine the maintenance.
Dick