What a beautiful place!
These waterfalls are on the border between Argentina and Brasil. The border runs down the middle of the river that the falls flow into.
There is another country, Paraguay, that also borders Argentina and Brasil here, and has the Parana River, which has the world's largest dam called Itaipu.
One can take a boat ride and get so close to the falls that you are drenched in their spray....way too fun! You can also repel down the sides in certain areas away from the falls, though we did not take part in that sport.
Natural beauty at it's best.....