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Updated: May 18, 2025
Neither of these three obstacles is to be feared with experienced Indian pilots. I dwell on these hydrographic details because a great political and commercial interest is now connected with the communications between Angostura and the banks of the Meta and the Apure, two rivers that lead to the eastern side of the Cordilleras of New Grenada.
The Wady Hamz, which has been mentioned as the southern frontier of Egyptian Midian, and the northern limit of the Ottoman Hejaz, is the most notable feature of its kind upon the North-Western Arabian shore. He appears to identify it with the classical Wady el-Kura. Sprenger clean ignores the name, although he mentions its branches; and of course it is utterly neglected by the Hydrographic Chart.
It was the bed of an intermittent stream a hydrographic phenomenon of frequent occurrence in the central regions of North America. The presence of water accounted for that of the cotton-wood trees a sure indication of moisture in the soil. The water was a welcome sight.
In order to point out more clearly the difference between geological and hydrographic views, and to prove that in the former, abstracting the course of the waters which meet in one recipient, we obtain a far more general point of view, I shall here again recur to the hydrographic basin of the Orinoco. That immense river rises on the southern slope of the Sierra Parime.
The chief of the Hydrographic Department at Washington heard of the failure of the experiment, and at once sent word to shipmasters the world over, urging them to watch carefully for these logs which he described; and to note the precise location of each in latitude and longitude and the time the observation was made.
"Why, Dad?" asked Tom in some surprise. "Because you'll find the water there of a greater depth than you think," was the answer. "I know you have the official hydrographic charts, but there's a mistake, I'm sure. I once made a study of that part of the ocean, and there are currents there at certain seasons of the year that no one suspects, and deep caverns that aren't charted.
Then, chart in hand, we returned to the deeds of the French navigator: his voyages to circumnavigate the globe, his double attempt at the South Pole, which led to his discovery of the Adélie Coast and the Louis-Philippe Peninsula, finally his hydrographic surveys of the chief islands in Oceania.
"Wait a minute though," he added hastily. "Here's something that looks like figures down in the lower left hand corner. Fifty-seven .... No! Sixty-seven-three is one, and thirteen-ten is the other." "That can only stand for longitude and latitude!" cried Tyke. "Quick, Allen, git down that Hydrographic Office chart. That'll cover it."
This river forms in the chain of the coast a kind of longitudinal valley, while the waters of the llanos, or of five-sixths of the province of Caracas, follow the slope of the land southward, and join the Orinoco. This hydrographic sketch may throw some light on the natural tendency of the inhabitants of each particular province, to export their productions by different roads.
A basin of a river, or hydrographic basin, has but one recipient, one emissary; if, by a bifurcation, it gives a part of its waters to another hydrographic basin, it is because the bed of the river, or the principal recipient, approaches so near the banks of the basin or the ridge of partition that the ridge partly crosses it.
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