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Its shifting channel is divided at its mouth by deltas created from the vast quantity of soil which the river carries in its current. On the low-lying, forest-clad, northern shore of the Gulf of Mexico it was not easy to find the mouth of the Mississippi by approaching it from the sea.
Each region of the Earth's surface has its special history of elevations, subsidences, periods of rest: and this history in no case fits chronologically with the history of any other portion. River deltas are now being thrown down on formations of different ages: some very ancient, some quite modern.
The water is clear in summer, but in winter it must be very muddy, for the Skagit is building one of the largest deltas upon Puget Sound. At Marble Mountain the traveller may, if he wishes, leave his horses, hire an Indian canoe, and float down the river to the nearest railroad station.
River mouths vary greatly; they are either estuaries, like those of the Thames, the Seine, and the S. Lawrence, or they are deltas, like those of the Nile, the Po, and the Rhone. Very generally in tidal seas we have estuaries; but in those that are tideless, as the Mediterranean and the Black Sea, they are deltas.
Amid the wheat fields of the Punjab, under the tamarinds of the Ganges plain, among the lotus pools and bamboo clusters of the Bengal deltas, and on the black cotton fields of the Deccan are the roads and the villages, the villages and the roads.
For the Gran Chaco is no sterile tract, like most parts of the Navajo country in the north, or the plains of Patagonia and the sierras of Arauco in the south. Nor is it a humid, impervious forest, at seasons inundated, as with some portions of the Amazon valley and the deltas of the Orinoco.
No doubt the fringe of an ice-covered region must be always liable to them; but, if we examine the records of such catastrophes in historical times, those produced in the deltas of great rivers, or in lowlands like Holland, by sudden floods, combined with gales of wind or with unusual tides, far excel all others.
And even if death catch people, like an open pitfall, and in mid-career, laying out vast projects, and planning monstrous foundations, flushed with hope, and their mouths full of boastful language, they should be at once tripped up and silenced: is there not something brave and spirited in such a termination? and does not life go down with a better grace, foaming in full body over a precipice, than miserably straggling to an end in sandy deltas?
The Drina, where much fighting occurs, is no ordinary waterway, no mere mountain stream, though it lies in a mountainous country. Before reaching its junction with the Save it is fed by many important tributaries. Ever swift, often torrential, it has washed out a bed of imposing width, and by a constant cutting out of new courses has created a series of deltas.
They were now approaching the mighty Amazon, and the river upon which they had hitherto been travelling appeared to divide into many branches, where it formed deltas with the Amazon.
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