On leaving camp we climbed to the summit of another gigantic dome of green pasture land (elev. 2,500 ft.). We filled our lungs with the delicious air, slightly stirred by a fresh northerly breeze. Geographically, we were at a most important site, for it was from that point that the division of waters took place between those flowing eastward into the Araguaya and those flowing westward into the Cuyabá River. So that within a distance of a few kilometres we had visited the region—the very heart of Brazil—from which the waters parted to flow toward three different points of the compass.
From that point we rose still higher to the summit of a great table-land, absolutely flat and waterless for over 30 kil. The soil was red in colour, with slippery dried grass upon it and sparse, stunted vegetation. The trees seldom reached a height of 5 ft. They were mostly gomarabia or goma arabica—a sickly-looking acacia; passanto with its huge leaves, piqui or pequia (Aspidosperma sessiliflorum and eburneum Fr. All.), the fibrous piteira or poteira (Fourcroya gigantea Vent.), and short tocun or tucum palms (Astrocaryum tucuma M.). Occasionally one saw a passanto tree slightly taller—perhaps some 10 to 12 ft. high—most anæmic-looking.
After having travelled some 24 kil. from our last camp we came to a great expanse of taquary, a kind of shrub 3 ft. high with spiky leaves of a wonderful green colour.
We gazed upon the superb view of an enormous plateau to the west with deep indentations in its vertical sides. Huge spurs or rams of rock stretched out across the deep depression, separating the plateau to the west from the one on which we were standing. Both plateaux were of equal height, and had evidently at one time formed one immense flat surface. On our side the plateau showed a huge slip of red volcanic earth, with a lower stratum parallel to it of baked brown rock. Under it were white lime and ashes, in sections or drifts. In the centre of the valley formed by the separation of the two sections there remained a formidable crater—extinct, of course—with an arc-shaped wall standing erect in its centre, and other lower walls forming an elongated quadrangular channel from south-east to north-west in the bottom of the crater. Two conspicuous monoliths stood up behind the huge lip of the crater to the south-west at the bottom of the valley, and also other remnants of the great convulsion of nature which had once taken place there.
A Cañon of Matto Grosso.
Notwithstanding the constant annoyance of my followers, I really enjoyed my journey over the central plateau. The air was fresh and deliciously crisp and clear. One could see for miles and miles and distinguish the smallest detail in the far-away mountain sides, so pure was the atmosphere. This scene was unlike any in other countries. One could describe an entire circle around oneself, and nowhere did the eye meet a column of smoke rising above ground to indicate the presence of man. Not a bird was to be seen or heard, not a footprint upon the ground of any beast or creature of any kind. The silence of that land was most impressive. Our voices—as we spoke—sounded astonishingly and abnormally sonorous, in that region which for thousands of years had not been contaminated by sound. It seemed as if the sound-waves, undisturbed by the myriads of sounds which—as is well known—remain floating in the atmosphere in inhabited countries, were heard there in all their full and absolute purity. So much were we all impressed by this fact—my men unconsciously—that all the men began to sing, so pleased they seemed with the powerful vibration of their own voices.
To the north-west another lovely sight was before us—another huge plateau in dim greyish blue—barring the horizon. In front of it was one more table-land, more broken up, and sloping on the south side.
When we reached the north-east edge of the plateau we were travelling upon, we were treated to a fresh marvellous scene. Straight in front of us, on the opposite side of a deep depression—at 30° bearings magnetic—there stood one of the characteristic two-tiered table-lands stretching from east to west. Below us in the depression was an undulating line from north to south of great bosses or domes of exquisite grassy land, resting upon a kind of spur or peninsula jutting out from our plateau—but at a lower elevation—of which it formed part.
