[1] Entre Ríos Island is located in a widening of the Paraná River between the localities of Yahapé [es] (to the west) and Itá Ibaté (to the east).

On its southern side, the Paraná River separates it from the rest of the Corrientes Province and Santa Isabel Island, constituting the fluvial limit between Argentina and Paraguay, located in the middle of its current, as it is the deepest branch of the Paraná River there.

In this branch, there are another 10 islets belonging to the archipelago that forms the Entre Ríos Island, all of them Argentinean property.

In the past, the island was home to a Paraguayan Navy detachment, but after its adjudication to Argentina, it has remained uninhabited.

After the end of the War of the Triple Alliance, both countries signed three treaties on February 3, 1876, one of them on limits, whose ratifications were exchanged on September 13, 1876.