7/ There are many more examples of disputes involving water, even between supposed allies.
As we covered in our Croatia thread - Croatia and
Slovenia disagree over the course of the border in the Adriatic:
https://en.osm.town/@opencage/109652965633848715
or Germany and
The Netherlands disagreeing over the border at the mouth of the Ems
https://de.wikipedia.org/wiki/Deutsch-Niederl%C3%A4ndische_Grenzfrage