The territory of the county is flat, with a small inclination in northwest-southeast address. The rocky blocks of the solid Uruguayan-Brazilian call Shield of Brasilia are to a side, while of the other one it is the arch of the mountains pampeanas. The highest levels are given in the region west, overcoming the 133 meters, this fringe goes diminishing in height as it descends between the counties of Córdoba and Santiago del Estero and Santa Fe.

The low submeridionals extends in the northwest angle. In the east of the county, the region of costs of the river Paraná, presents a low relief and anegadizo, and they usually flood with the growing of the bed.

To the south of the city of Santa Fe, the coast of the river Paraná is formed by ravines until the limit with the county of Buenos Aires.

The rivers that travel the territory santafesino finish paying to the river Paraná. El Salado rivers and Carcarañá have their origin in the mountainous area. The rest fills its beds with the fallen precipitations. The most important river without a doubt is the Paraná, its flow it covers more than 2.800.000 of square kilometers. Their journey includes the countries of Brazil, Bolivia and Paraguay. Their main tributaries are the rivers Carcarañá formed by the rivers Tercero and Curator and the arroyo del Medio that it defines with the province of Buenos Aires. The Salado is also one of their tributaries, being the same one that of bigger basin hídrica of the interior of the province.

River Paraná : It is after the river Amazons, the most important via of water of America of the South. In Argentinean territory it has an extension of 1.800 kilometers. It is navigable in a journey of 2.100 kilometers, from the River de la Plata until Port Adela, in Paraguay, next to the falls of the Guayrá. The river consists of three tracts: the High Paraná, is the one understood from its birth until its fork with the river Paraguay; the Half Paraná: until Diamond (Pcia. Entre Ríos) and Inferior Paraná: until the fork with the river Uruguay.

High river Paraná is Born in Brazil and they form it two rivers, the Paranahiba that picks up the waters of the mountains Pyrenees, Tapioconga and it gives Matta and el Grande, with its nascent ones in the mountain of Mantiqueira and Spine. The High Paraná, formed starting from the fork of the mentioned rivers, increases its flow considerably with the contribution of numerous tributaries. Until then it is mountain river and of plateau, of banks barrancosas that are distanced to each other from 2 to 4 Kilometers, their channel is rocky, serpentine, it presents numerous jumps and whirls. The High Paraná forms the limit between Paraguay and Brazil, and starting from that the River Iguazú overturns its waters in him, it establishes the limit among the Republic Argentina and the Republic of Paraguay that it is prolonged until the fork with the river Paraguay. The tract Iguazú - Inns don't offer difficulties for the sailing, their bed is narrow, of high margins and depth of up to 50 meters. After Inns the river transforms, it changes direction, forming the frontier between the province of Corrientes and Paraguay, the banks barrancosas, the slope and the difference of its channel disappear, its width increases to 3 Km to the height of the city of Corrientes and the islands become numerous. As consequence of the abundant rains, the High Paraná takes great quantity of water, the growing one it begins in October and it lasts until February. Starting from March the waters descend until the month of August or September. The navigability of the river is taken advantage of for transport of loads and passage in intense form under the Iguazú. In the steps that exist between Corrientes and Ituzaingo, the minimum depth 2,70 meters stays had dredged. The Argentinean ports built along the High Paraná are Iguazú, Esperanza, Eldorado, Piray, Rico and Posadas (in the province of Missions) and Ituzaingo, Itá Ibaté, Itatí and Corrientes (in the province of Corrientes).

River Half and inferior Paraná : it begins from the Fork Paraguay - High Paraná in front of Paso de la Patria (Corrientes) and the island of the Cerritol (Chaco), site where the river twists the direction toward the south, forming a right angle. It defines Corrientes and Entre Ríos, located to the east, of the counties of Chaco, Santa Fé and Buenos Aires, located to the west of the river. The Paraná you restitution of cloudy waters, the channel is oozy, less quick and less impetuous, but it becomes more imposing. It is a plain river, their width it diminishes from the 4,2 Kilometers in front of Currents, to 2,6 Kilometers in front of Bella Vista and 2,3 Kilometers in front of Santa Fé. Alone one of the two banks has ravines, until the vicinities of the city of Paraná, the ravines are on the side of Entre Ríos, starting from Paraná, the coast santafecina rises until its outlet.

The low coasts are easily inundable during the grown of the Paraná. The river is navigable from its outlet until Corrientes. The most important ports are:

- In Entre Ríos: Paraná, Diamond and Ibicuy

- In Santa Fé: Santa Fe , Rosario, San Lorenzo, and Villa Constitution