The peninsula is almost wholly composed of a bed of coralline and porous limestone rocks, forming a low tableland, which rises gradually toward the S.
The basin is comparatively narrow, and the Tagus, like the other rivers of the Iberian tableland, generally flows in a rather confined valley, often at the bottom of a rocky gorge below the general level of the adjacent country.
As the tableland runs northward it decreases both in height and width, until it narrows to a few miles only, with an elevation of scarcely 1500 ft.; under the name of the Blue Mountains the plateau widens again and increases in altitude, the chief peaks being Mount Clarence(4000 ft.), Mount Victoria (3525 ft.), and Mount Hay (3270 ft.).
Passing from the coast to the tableland, a distinct climatic region is entered.
Cooma, with a mean summer temperature of 65.4°, and a mean winter temperature of 41.4°, may be taken as illustrative of the climate of the southern tableland, and Armidale of the northern.
The first of these comprises chiefly the mines of the Hunter river districts; the second includes the Illawarra district, and, generally, the coastal regions to the south of Sydney, together with Berrima, on the tableland; and the third consists of the mountainous regions on the Great Western railway and extends as far as Dubbo.
Helmfeld routed a Danish division, was the first gleam of good luck, and on the 4th of December, on the tableland of Helgonaback, near Lund, the young Swedish monarch defeated Christian V.
The actual elevation of a summit above sea-level does not necessarily affect its mountainous character; a gentle eminence, for instance, rising a few hundred feet above a tableland, even if at an elevation of say 15,000 ft., could only be called a hill.
The high tableland of Tibet and Pamir to the lower plateaus of Mongolia, and thence N.E.
From these lofty ranges there extends a broad tableland (in many parts more than 3000 ft.
Others that are exceedingly productive are the black calcareous loam of the prairies, the calcareous silt of the bluff belt along the eastern border of the Delta, and the brown loam of the tableland in the central part of the state.
The eastern flank of this tableland follows a line of hills drawn a short distance from the Indus, between the mouth of that river and the Himalaya, about on the 72nd meridian; these hills do not generally exceed 4000 or 5000 ft.
The north - eastern portion of the Afghan tableland abuts on the Himalaya and Tibet, with which it forms a continuous mass of mountain between the 71st and 72nd meridians, and 34° and 36° N.
The great elevated tableland of Tibet or to the central depression which exists to the north of it.
The Zancara rises near the source of the Jucar, in the east of the tableland of La Mancha; thence it flows westward, assuming the name of Guadiana near Ciudad Real, and reaching the Portuguese frontier 6 m.
The most elevated tracts are on the west, where the surface rises towards the culminating range of hills, and on the south, where it rises to the elevated tableland of Mysore.
Basutoland, or Lesuto (Lesotho) as the natives call it, forms the south-eastern edge of the interior tableland of South Africa, and has a rugged and broken surface with a mean elevation of 6000 ft.
From the tableland north of the Maluti several isolated hills rise, the most noted being the almost inaccessible Thaba Bosigo - the rallying place of the Basuto in many of their wars.
The great Brazilian plateau, which is the most important physical division of Brazil, consists of an elevated tableland moo to 3000 ft.
It rises on an elevated tableland in the state of Sao Paulo and flows across the state of Rio de Janeiro from west to east, through a broad fertile valley producing coffee in its most elevated districts and sugar on its alluvial bottom-lands nearer the sea.
It receives the drainage of the northern slopes of the Satpuras, but not that of the Vindhyan tableland, the streams from which flow into the Ganges and Jumna.
- About five-sixths of the country lies west of the Drakensberg, the mountain range which forms the inner rim of the great tableland of South Africa.
- Zululand is part of the region of hills and plateaus which descend seaward from the Drakensberg - the great mountain chain which buttresses the vast tableland of inner South Africa.
The Hindu Kush is, in fact, but the face of a great upheaved mass of plateau-land lying beyond it northwards, just as the Himalaya forms the southern face of the great central tableland of Tibet, and its general physiography, exhibiting long, narrow, lateral valleys and transverse lines of "antecedent" drainage, is XIII.
With the exception of a few villages in the west, the whole district is situated on a tableland from 1300 to 2000 ft.
Traditionally Toluca was one of the earliest Toltec settlements on the Anahuac tableland, but no remains of this occupation have been preserved.
Its western portion, the Basim taluk, consists of a fertile tableland, about 1 000 ft.
The so-called mountain mocking-bird (Oreoscoptes montanus) is a form not very distant from Mimus; but it inhabits exclusively the plains overgrown with sage-brush (Artemisia) of the interior tableland of North America, and is not at all imitative in its notes, so that it is an instance of a misnomer.
For the most part the surface is that of a prairie tableland, moderately rolling, and with a general but scarcely perceptible slope, which in the eastern two-thirds is from N.W.
The principal right-hand tributaries, besides the Gallo and Zezere, are the Jarama, descending from the tableland of New Castile a little below Aranjuez, the Alberche and the Tietar, which collect their head waters from opposite sides of the Sierra de Gredos, and the Alagon, from the rough and broken country between the Sierras de Gredos and Gata.
Viadua; Slavonic, Vjodr), a river of Germany, rises in Austria on the Odergebirge in the Moravian tableland at a height of 1950 ft.
While the coast lands are either densely forested or covered with savannas or park-like country, the Futa Jallon tableland is mainly covered with short herbage.
This tableland, the hydrographic centre of West Africa, is most elevated in its southern parts, where heights of 5000 ft.
At Annesley Bay the narrow coast plain is succeeded by foothills separated by small valleys through which flow innumerable streams. From these hills the ascent to the plateau which constitutes northern Eritrea is very steep. This tableland, which has a general elevation of about 6500 ft., is fairly fertile despite a desert region - Sheb - to the S.E.
In the east the tableland falls away to the basins of the Congo and Zambezi, to the south it merges into a barren sandy desert.
From the tableland the Kwango and many other streams flow north to join the Kasai (one of the largest affluents of the Congo), which in its upper course forms for fully 300 m.
Ultimately the Dravidians were driven back into the southern tableland, and the great plains of Hindustan were occupied by the Aryans, who dominated the history of India for many centuries thereafter.
The high tableland of the Balaghat lies for the most part upon the great basaltic formation which stretches across the Satpuras as far east as Jubbulpore.
But, regarded broadly, the Highland mountains are monuments of erosion, the relic of an old tableland, the upper surface and former inclinations of which are shown approximately by the summits of the existing masses and the direction of the chief water-flows.
Seen from an eminence on their surface, the inference is irresistible that these plateaus are fragments of the original tableland, trenched into segments by the formation of the longitudinal and transverse valleys.
Distinguished especially by the smoothness of their surface, they may be regarded as a roiling tableland or moorland, traversed by many valleys conducting the drainage to the sea.
Among the Southern Uplands exist traces of a similar tableland of erosion.