ADAM'S BRIDGE, or Rama'S Bridge, a chain of sandbanks extending from the island of Manaar, near the N.W.
Some of the sandbanks are dry; and no part of the shoal has a greater depth than 3 or 4 ft.
As the mouth is choked with sandbanks, goods are disembarked at Mariinsk and carried by train (9 m.) to Alexandrovsk at the head of the Gulf of Tartary.
Its mouth is divided by sandbanks into many channels.
In front of the delta are sandbanks and rocks which prevent the passage of vessels except by a canal, 18 m.
One consequence of this is that the bed of the river just below Hamburg is obstructed by a bar, and still lower down is choked with sandbanks, so that navigation is confined to a relatively narrow channel down the middle of the stream.
The sea immediately east of the town has a considerable depth, but its navigation is impeded by sandbanks and a bar north and west of the town, which can be passed only by vessels drawing not more than 9 ft.
In the dry season, however, it is obstructed by reefs, sandbanks, shallows, snags, trees and floating timber from the "Apostadero" up, so that even canoes find its ascent difficult, while savage hordes along its banks add to the dangers to be encountered.
The navigation of the stream is considerably obstructed by sandbanks, but vessels of 200 tons can unload at the quays, which, with the town and Friarton harbours, lie below the South Inch.
Its coast is studded with low islands and sandbanks, the results of the deposits brought down by the Hwang-ho.
Long narrow sandbanks almost separate Chifunawuli, the western part of the lake, from the main body of water, while the water surface is further diminished by a number of islands.
Dredging machines are kept constantly at work, while steamers are stationed near the most dangerous sandbanks to assist vessels that run aground.
Below the town the river divides into several branches, among islands and sandbanks, receiving before it enters the sea the Bolderaa river, and expanding towards the east into wider lacustrine basins.
Usually it is found on the British coast encrusting rocks exposed at low tides, or on the flat surfaces formed by sandbanks overlying clay, the latter kind of colonies being known locally as "scalps."
Through the sandbanks which form its bed there are two main channels into deep water; one, Boston Deeps, is kept open by the waters of the Witham and Welland; the other, Lynn Deeps, gives passage to those of the Nene and the Great Ouse.
Owing to the prevalence of shallows and sandbanks, navigation is difficult.