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Entre Ríos is a northeastern province of Argentina, located in the Mesopotamia region. It borders the provinces of Buenos Aires (south), Corrientes (north) and Santa Fe (west), and Uruguay in the east. Its capital is Paraná (250,000 inhabitants), which lies on the Paraná River, opposite the city of Santa Fe.

As part of the Mesopotamic region, the land is almost completely flat, with hills some 100 meters in height. There are two main systems of low hills, called lomadas or cuchillas: the Cuchilla de Montiel (west) and the Cuchilla Grande (east), which are separated by the Gualeguay River.

The name of the province means "among rivers". Entre Ríos is limited and traversed by many rivers and streams: the Paraná River and its delta to the west and south; the Uruguay River and the Mocoretá River to the east; and the Guayquiraró River to the north.

The weather variates form subtropical in the north to temperate towards the Pampas. The annual rainfall is about 1150 mm in average, and occasional pampero and other local winds bring storms to the area.

Two national parks are located within the province: El Palmar National Park and Diamante National Park. There are also hot springs in several locations, especially along the basin of the Uruguay River, located in cities like Federación, Villa Elisa, Colón, etc. Probably the best two birding areas in the region are Ceibas in the southeast of the province with its wetlands and Perdices.