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The Ebro is the second longest Spanish river. First named the Iberus, for the Iberian Peninsula, it rises in the Cantabrian Mountains, where it is named Híjar. The river flows through gorges and flat hills down to La Rioja, where it forms a basin bounded on the north by the Pyrenees and on the south by the Iberian Mountains. The Ebro passes through a varied landscape of hills, flat expanses of arable land, and fertile lowland down to Mequinenza, carving gorges and canyons. Further on, the Ebro reaches Tortosa and flows into the Mediterranean. Its tributaries come from the Pyrenees: the Aragón, Gallego, Cinca, Noguera, and Segre Rivers. On the west the Jalón connects with the Meseta (plateau), and the Jiloca with Teruel province.