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In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material, and rises from the bed of a body of water close to the surface or above it, which poses a danger to navigation.
The first attempt to place a light on Rebecca Shoal was under the direction of Lt. George Meade starting in 1854. After structures were washed away twice in 1855 while still being erected, Meade wrote, "I believed then, and am satisfied now, that no light-house structure of any kind has been erected, either in this country or in Europe, at a ...
The American Shoal Light is located east of the Saddlebunch Keys, just off Sugarloaf Key, close to Looe Key, in Florida, United States. [ 5 ] [ 6 ] [ 7 ] It was completed in 1880, and first lit on July 15, 1880.
Shoals and sandbanks are characteristic underwater seabed features of the southern North Sea and the eastern English Channel. The relatively shallow water depth allows tidal currents to transport, configure and alter seabed materials, such as sand, shells, clay, and gravel, into elongated banks or shoals of shallow water.
The Stratford Shoal Light is located roughly midway between New York and Connecticut (hence its alternate name Middleground or Middle Ground Light), 5 nautical miles (9.3 km; 5.8 mi) from Old Field Point Light in New York and 5.5 nautical miles (10.2 km; 6.3 mi) from Stratford Point Light in Connecticut. [6]
Scarborough Shoal forms a triangle-shaped chain of reefs and rocks with a perimeter of 46 km (29 mi). It covers an area of 150 km 2 (58 sq mi), including an inner lagoon.
Frying Pan lightship and light tower. The Frying Pan Shoals are a shifting area of shoals off Cape Fear in North Carolina, United States.Formed by silt from the Cape Fear River, the shoals are over 28 miles long and resemble a frying pan in shape. [1]
Ordinarily it displays a 15,000 candela 14.8 inches (375 mm) light powered by a 120 volt electric lamp. Power is supplied through a submarine cable, which crosses the shoal from Point Lookout. The 75-foot (23 m) focal plane makes its flash (1-second every 5 seconds) visible for 14 nautical miles; 26 kilometres (16 mi).