sentences:  Of all the oaks, the Pyrenean oak ("Quercus pyrenaica") is the most resistant to drought and the continental-style climate.These forests, of a sub-Atlantic character, often represent the shift from Mediterranean vegetation to Atlantic vegetation.They cover a wide area of the peninsula and are of great importance, above all on the mountain ranges in the centre of the peninsula; from the interior of Galicia and extending south of the Cordillera Cantábrica they extend throughout the Sistema Central, reaching, to the south, (though scarce by the time they reach this region) the Sierra Nevada and Cádiz.