The White Company by Sir Arthur Conan Doyle

To the south of Pampeluna in the kingdom of Navarre there stretched a high tableland, rising into bare, sterile hills, brown or gray in color, and strewn with huge boulders of granite. On the Gascon side of the great mountains there had been running streams, meadows, forests, and little nestling villages. Here, on the contrary, were nothing but naked rocks, poor pasture, and savage, stone-strewn wastes. Gloomy defiles or barrancas intersected this wild country with mountain torrents dashing and foaming between their rugged sides. The clatter of waters, the scream of the eagle, and the howling of wolves the only sounds which broke upon the silence in that dreary and inhospitable region.

Through this wild country it was that Sir Nigel and his Company pushed their way, riding at times through vast defiles where the brown, gnarled cliffs shot up on either side of them, and the sky was but a long winding blue slit between the clustering lines of box which fringed the lips of the precipices; or, again leading their horses along the narrow and rocky paths worn by the muleteers upon the edges of the chasm, where under their very elbows they could see the white streak which marked the gave which foamed a thousand feet below them. So for two days they pushed their way through the wild places of Navarre, past Fuente, over the rapid Ega, through Estella, until upon a winter's evening the mountains fell away from in front of them, and they saw the broad blue Ebro curving betwixt its double line of homesteads and of villages. The fishers of Viana were aroused that night by rough voices speaking in a strange tongue, and ere morning Sir Nigel and his men had ferried the river and were safe upon the land of Spain.