from the Valley of the Cauto, are similar in structure to the northern foothills of the main sierra. In the western part of the range, the mountains rise abruptly from the depths of the Caribbean Sea, but near the City of Santiago, and to the eastward, they are separated from the ocean by a narrow coastal plain, very much dissected. The streams which traverse it occupy valleys several hundred feet in depth, while the remnants of the plateau appear in the tops of the hills.
East of Guantanamo Bay there are mountains which are structurally distinct from the Sierra Maestra, and these continue to Cape Maysi, the eastern terminus of Cuba. To the west they rise abruptly from the ocean bed, but further east they are bordered by terraced foothills. Towards the north they continue straight across the island as features of bold relief, connecting with the rugged Cuchillas of Baracoa, and with "El Yunque" lying to the southwest.
Extending west from this eastern mass are high plateaus and mesas that form the northern side of the great amphitheatre which drains into Guantanamo Bay. Much of this section, when raised from the sea, was probably a great elevated plain, cut up and eroded through the ages since the seismic uplift that caused its birth.
The most prominent feature of the northern mountains of Oriente Province, west of "El Yunque," is the range comprising the Sierras Cristal and Nipe. These extend east and west, but are separated into several distinct masses by the Rio Sagua, and the Rio Mayari, which break through and empty into harbors on the north coast. The high country south of these ranges has the character of a deeply dissected plateau, the upper stratum of which is limestone.
The character of the surface would indicate that nearly all the mountains of the eastern part of Oriente have been carved through erosion of centuries from a high plateau, the summits of which are found in "El Yunque" near Baracoa, and other flat topped mountains within the drainage basins of the Mayari and the Sagua rivers. The flat summits of the Sierra Nipe are probably remnants of the same great uplift.
Below this level are other benches or broad plateaus, the two most prominent occurring respectively at 1,500 and 2,000 feet above sea level. The highest summits rise to an altitude of 2,800 or 3,000 feet. The 2,000 foot plateau of the Sierra Nipe alone includes an area estimated at not less than 40 square miles. It would seem that these elevated plateaus with their rich soils might be utilized for the production of wheat, and some of the northern fruits that require a cooler temperature than that found in other parts of Cuba.
In the province of Oriente, the various mountain groups form two marginal ranges, which merge in the east, and diverge toward the west. The southern range is far more continuous, while the northern is composed of irregular groups separated by numerous river valleys. Between these divergent ranges lies the broad undulating plain of the famous Cauto Valley, which increases in width as it extends westward. The northern half of this valley merges into the plains of Camaguey, whose surface has been disturbed by volcanic uplifts only by a small group known as the Najassa Hills, in the southeast center of the province, and by the Sierra Cubitas Range, which parallels the coast from the basin of Nuevitas Bay until it terminates in the isolated hill known as Loma Cunagua.
The central mountainous region of the island is located in the province of Santa Clara, where a belt of mountains and hills following approximately northeast and southwest lines, passes through the cities of Sancti Spiritus and Santa Clara. Four groups are found here, one of which lies southwest of Sancti Spiritus and east of the Rio Agabama. A second group is included between the valleys of the Agabama and the Rio Arimao.
The highest peak of Santa Clara is known as Potrerillo, located seven miles north of Trinidad, with an altitude of 2,900 feet. A third group lies southeast of the city of Santa Clara, and includes the Sierra del Escambray and the Alta de Agabama. The rounded hills of this region have an altitude of about 1,000 feet although a few of the summits are somewhat higher.
The fourth group consists of a line of hills, beginning 25 miles east of Sagua la Grande, and extending into the province of Camaguey. The trend of this range is transverse with the general geological structure of the region.
East of the city of Santa Clara the hills of this last group merge with those of the central portion of the province. The summits in the northern line reach an altitude of only a thousand feet. The principal members are known as the Sierra Morena, west of Sagua la Grande, Lomas de Santa Fe, near Camaguini, the Sierra de Bamburanao, near Yaguajay, and the Lomas of the Savanas, south of the last mentioned town.
In the province of Pinar del Rio, we find another system, or chain of mountains, dominated by the Sierra de los Organos or Organ mountains. These begin a little west of Guardiana Bay, with a chain of "magotes" known as the "Pena Blanca," composed of tertiary limestone. These are the result of a seismic upheaval running from north to south, almost at right angles with the main axis of the chains that form the mountainous vertebrae of the island.
Between the city of Pinar del Rio and the north coast of La Esperanza, the Organos are broken up into four or five parallel ridges, two of which are composed of limestone, while the others are of slate, sandstones and schists. The term "magote," in Cuba, is applied to one of the most interesting and strikingly beautiful mountain formations in the world. They are evidently remnants of high ranges running usually from east to west, and have resulted from the upheaval of tertiary strata that dates back probably to the Jurassic period.
The soft white material of this limestone, through countless eons of time, has been hammered by tropical rains that gradually washed away the surface and carved their once ragged peaks into peculiar, round, dome-shaped elevations that often rise perpendicularly to a height of 1,000 feet or more above the level grass plains that form their base. Meanwhile the continual seepage of water formed great caverns within, that sooner or later caved in and fell, hastening thus the gradual leveling to which all mountains are doomed as long as the world is supplied with air and water. The softening and continual crumbling away of the rock have formed a rich soil on which grows a wonderful wealth of tropical vegetation, unlike anything known to other sections of Cuba, or perhaps to the world.
The valley of the Vinales, lying between the city of Pinar del Rio and the north coast, might well be called the garden of the "magotes," since not only is it surrounded by their precipitous walls, but several of them, detached from the main chain, rise abruptly from the floor of the valley, converting it into one of the most strangely beautiful spots in the world.
John D. Henderson, the naturalist, in speaking of this region, says: "The valley of the Vinales must not be compared with the Yosemite or Grand Cañon, or some famed Alpine passage, for it cannot display the astounding contrast of these, or of many well-known valleys among the higher mountains of the world. We were all of us traveled men who viewed this panorama, but all agreed that never before had we gazed on so charming a sight. There are recesses among the Rocky Mountains of Canada into which one gazes with awe and bated breath, where the very silence oppresses, and the beholder instinctively reaches out for support to guard against slipping into the awful chasm below. But the Valley of Vinales, on the contrary, seems to soothe and lull the senses. Like great birds suspended in the sky, we long to soar above it, and then alighting within some palm grove, far below, to rejoice in its atmosphere of perfect peace."
A mountain maze of high, round-topped lomas, dominates almost the entire northern half of Pinar del Rio. It is the picturesque remnant of an elevated plain that at some time in the geological life of the island was raised above the surface 1,500, perhaps 2,000, feet. This, through the erosion of thousands of centuries, has been carved into great land surges, without any particular alignment or system.
Straight up through the center of this mountainous area are projected a series of more or less parallel limestone ridges. These, as a rule, have an east and west axis, and attain a greater elevation than the lomas. They are known as the Sierras de los Organos, although having many local names at different points. Water and atmospheric agencies have carved them into most fantastic shapes, so that they do, in places, present an organ pipe appearance.
