In one of the widest stretches across the Iguazu River, awaits the most important and monumental waterfall of Iguazu cascades system: the Devil's Throat.

The Argentina–Brazil border runs through the Devil's Throat. On the right bank is the Brazilian territory, which is home to more than 95% of the Iguazu River basin but has just over 20% of these falls, and the left side jumps are Argentine, which makes up almost 80% of the falls.

It is the largest of about 275 waterfalls making up Iguazu Falls. Together, they make up the largest waterfall in the world. The falls divide the river into the upper and lower Iguazu. For most of its course, the river flows through Brazil; however, most of the falls are on the Argentine side. Below its confluence with the San Antonio River, the Iguazu River forms the boundary between Argentina and Brazil.

The Devil's Throat canyon is 80–90 m (260–300 ft) wide and 70–80 m (230–260 ft) deep. Left of this canyon, another part of the river forms 160-200 individual falls, which merge into a single front during flood stage.

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