10/ Sometimes disputes arise because the old methods of surveying the border werenβt very accurate. This can lead to surprises when the border is re-surveyed using more modern technologies, like this example between US πΊπΈ states North and South Carolina.
https://www.cbsnews.com/news/border-redraw-in-the-carolinas-would-mean-19-homes-changing-states/
11/ There are even bizarre situations where two bordering countries claim to both NOT own territory.
See for example the case of "Liberland" on the Danube which is claimed by neither Croatia ππ· nor Serbia π·πΈ
We covered it in our #geoweirdness thread about Croatia:
https://en.osm.town/@opencage/109652905104538351