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The upheaval of the land went on during the Devonian and Silurian epochs until it formed what is now the whole of Galicia, part of the Asturias, León, and Zamora, and as far down as Toledo, Ciudad Real, Cordova, Huelvas, and the Algarves, while, to the east and north, were formed the Catalonian coast and a great part of the Pyrenees.
Large islands arose in the neighbourhoods of Burgos, Soria Daroca, Granada, Malaga, and Gibraltar.
To the south-east of this was another island, where is now Bejar and Sierra de Gredos, comprising part of the Provinces of Avila, Segovia, and Toledo.
To the north-east, the Pyrenees and the Catalonian coast took the form of islets, while in other directions other islets occupied the sites of Lisbon, Evora, Cáceres, Badajoz, Seville, Cordova, and Jaén.
The unevenness of the country at the same time results in great differences of climate.
The contrast extends even to the seas surrounding Spain — the tranquil Mediterranean, the stormy Bay of Biscay, and the Atlantic with a character midway between.The eastern portions of the Peninsula were built up during the Cretacean period, while, between these formations and the Granitic and Silurian, extensive lakes were left which have since disappeared but which may still be traced in the level steppes of Aragón and the two Castiles.What is now the Ebro was then a vast lake extending through the Eocene and Pliocene formations of Lérida, Saragossa, and Logroño, and joining in the regions of Sto.Owing to the diversity of formations described above, and the elevation of the central portions, the surface of the Peninsula is, in general, of an uneven character with a very unequally distributed irrigation, some regions enjoying a wonderful fertility, while others are nothing but steppes.In other parts, again, the abrupt slope of the ground is such that the rains produce torrential floods in the rivers and thus negative their beneficial action.