The geography of Catalonia, the last Iberian region with which we have to deal, is more simple than that of Galicia. The land is formed by a broad mountain belt running out from the eastern end of the Pyrenees, parallel to the Mediterranean. From this chain the slopes run down and form on the eastern side a coast-plain, generally rather narrow, on the western a series of parallel valleys drained by tributaries of the Segre, the most important affluent of the Ebro. They all unite near Lerida, an important town and a great centre of roads. But two considerable rivers, the Ter and the Llobregat, have small basins of their own in the heart of the central mountain mass, which open down into the coast-plain by defiles, the one blocked by the peak of Montserrat, the other by the town of Gerona. During the greater part of the Peninsular War the French held the larger share of the shoreland, dominating it from the great fortress of Barcelona, which they had seized by treachery ere hostilities began. In 1811 they captured Tarragona also, the second capital of the sea coast. But they never succeeded in holding down all the small upland plains, and the minor passes that lead from one to the other. Hunted out of one the Spanish army took refuge in the next, and, though it dwindled down ultimately to a mass of guerilla bands, was never caught _en masse_ and exterminated. There were too many bolt-holes among the network of hills, and the invaders never succeeded in stopping them all, so that down to the end of the war the patriots always maintained a precarious existence inland, descending occasionally to the shore to get ammunition and stores from the English squadrons which haunted the coast. They were supplied and reinforced from the Balearic Isles, which Napoleon could never hope to touch, for his power (like that of the witches of old) vanished when it came to running water. The survival of the Catalan resistance after the French had drawn a complete cordon around the hill-country, holding the whole coast-plain on the one hand, and Lerida and the Segre valley on the other, is one of the incidents of the war most creditable to Spanish constancy.