Sometimes they occupy the approaches to tablelands, the narrowest points of gorges, or the fords of rivers; sometimes almost inaccessible mountain tops or important points on ridges; and it may be noticed that, where two important nuraghi are not visible from one another, a small one is interpolated, showing that there was a system of signalling from one to another.
On the higher, arid, sun-parched tablelands of San Juan.
Per annum, the tablelands 32 in., and the western interior has an average as low as 20 in.
The climate of the Northern Territory is extremely hot, except on the elevated tablelands; altogether, the temperature of this part of the continent is very similar to that of northern Queensland, and the climate is not favourable to Europeans.
The flat lands which extend from the base of the Alpine foothills to the shores of the Arctic Ocean, assume the character either of dry deserts, as in the Aral-Caspian depression, or of low tablelands, as in central Russia and E.
Russia; the Valdai tablelands, where all the great rivers of Russia take their rise; the broad and gently sloping meridional belt of the Ural Mountains; and lastly the Taimyr, Tunguzka and Verkhoyansk ranges in Siberia, which, notwithstanding their sub-Arctic position, do not reach the snow-line.
The northern shore, along the Gulf of Aden, is backed by tablelands separated by the beds of mountain torrents - generally dry.
In the south the Cevennes separate the cold and barren tablelands v.
The Amazonian chapadao, which includes the remainder of the great Brazilian plateau west of the Sao Francisco and Parnahyba regions and which appears to be the continuation of these tablelands westward, is much the largest of these plateau divisions.
The largest of these and the only one of commercial value is the Ribeira de Iguape, which has its source on the tablelands of Parana and after receiving several affluents west of the Serra do Mar breaks through a depression in that range and discharges into the Atlantic"some miles below Santos on the southern boundary of the state of Sao Paulo.
The sun temperature is high on these barren tablelands, but the nights are cool and refreshing.
South and south-west of this arid plateau lie the inhabited tablelands of Rio de Janeiro, Sao Paulo and Minas Geraes, where the climate is greatly modified by a luxuriant vegetation and southerly winds, as well as by the elevation.
South of Sao Paulo the tablelands of Parana, Santa Catharina and Rio Grande do Sul enjoy a temperate climate, with an abundant rainfall.
Rising in the high tablelands or on the slopes of the Drakensberg or Lebombo mountains the rivers in their upper courses have a great slope and a high velocity.
The surface presents few striking topographic features, and may be subdivided into three vast plains or prairie tablelands rising one above the other from E.
Which may account, perhaps, for its rarity, if, indeed, it be really scarce in its native home, which is probably the eastern slopes and tablelands of the Bolivian and Peruvian foot-hills bordering on Brazil, inclusive of the headwaters of the Purus, Acre and Jurua rivers.
Of these rocks Sir Archibald Geikie says: " Two great phases or types of volcanic action during Carboniferous time may be recognized - (r) Plateaus, where the volcanic materials discharged copiously from many scattered openings now form broad tablelands or ranges of hills, sometimes many hundreds of square miles in extent and 1500 ft.
The process by which the ancient tablelands have been trenched into valleys and confluent ridges is most instructively displayed among the higher mountains, where erosion proceeds at an accelerated pace.
On the African side there are in the north wide stretches of desert plain, which towards the south rise to elevated tablelands, and ultimately to the mountains of Abyssinia.
The tablelands cover an area of 85,000 sq.
The highlands of New South Wales consist, geographically, of a series of tablelands, now in the condition of dissected peneplains; geologically, they are built of a foundation of Archean and folded Lower Palaeozoic rocks, covered in places by sheets of more horizontal Upper Palaeozoic and Mesozoic rocks; these deposits occur along the edge of the highlands, and are widely distributed on the floor of the coastal districts.
It is covered in places by tablelands and ridges of the Desert Sandstone, the remnants of a sheet which doubtless once covered the whole of the Western Plains.
The area under crop on the coast districts is about 320,000 acres; on the tablelands 375,000 acres; on the western slopes, i,Ioo,000 acres; the Riverina district, 750,000 acres; the western plains, chiefly in the central portion, 270,000 acres; and less than 20,000 acres in the western division, which comprises nearly half the total area of the state.
The rest of the Daghestan region consists of a series of roughly parallel folds, of Jurassic or Cretaceous age, ranging in altitudes from 7500 up to 12,500 ft., separated from one another by deep gorge-like river glens which cut it up into a number of arid, treeless plateaus which have something of the appearance of independent ranges, or rather elongated tablelands of a mountainous character.
The most prominent of these tablelands is Bash-lam, which stretches east and west between the Chanti Argun and the Andian Koisu, both tributaries of the Terek.
These tablelands and mountains constitute Abyssinia, Shoa, Kaffa and Galla land.
Above the sea, while the plains or tablelands surrounding it vary in height from 1200 to 2000 ft.
At the time of the Spanish Conquest the most important of these tribes was the Muyscas or Chibchas, who inhabited the tablelands of Bogota and Tunja, and had attained a considerable degree of civilization.