The Latin name may be related to that of Iberia and the pre-Roman Iberians (and Celtiberians). It may have a relation to the modern Basque word ibar ("a kind of valley").
The Ebro Basin is a foreland basin localized in northern Spain, closed by the Pyrenees and basque-cantabric mountains; by the Iberian Range and by the Catalonian Coastal ranges.
The most important rivers forming the fluvial network are the Ebroriver, as the main river in the system and its tributary San Gines river.
The area is a little part of the Ebro basin, is limited in the north by Sierra Cantabria, sometimes taken as the southern edge of the Pyrenees and by the proper Ebroriver.
However, the river's source is often given a few kilometres downstream at Fontibre, As it moves out of the Cordillera it cuts eastwards across the Peninsula, forming the Ebro Depression and effectively separating the Pyrenees from the Sístema Ibérica.
The north bank of the river is fed first by the rivers of the Cordillera Cantábrica and then by those of the Pyrenees, including the Aragón, Gállego and Cinca-Segre, and to the south generally with a lower discharge, by tributaries from the Sistema Ibérico, including the Oja, Iregua, Jalón and Guadalope.
Although the Ebro has a significant discharge (for a Spanish river) this flow is irregular during the year with low levels at the end of summer and high levels during the spring melt of the Pyrenees, leading to a danger of flooding along much of its easterly length.
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