Hell Gate is a narrow tidal strait in the East River in New York City. It separates Astoria, Queens, from Randall's and Wards Islands in Manhattan.
A cay, also spelled caye or key, is a small, low-elevation, sandy island on the surface of a coral reef. Cays occur in tropical environments throughout the Pacific, Atlantic, and Indian oceans, including in the Caribbean and on the Great Barrier Reef and Belize Barrier Reef.
A tide pool or rock pool is a shallow pool of seawater that forms on the rocky intertidal shore. These pools typically range from a few inches to a few feet deep and a few feet across. Many of these pools exist as separate bodies of water only at low tide, as seawater gets trapped when the tide recedes. Tides are caused by the gravitational pull of the sun and moon. A tidal cycle is usually about 25 hours and consists of two high tides and two low tides.
City Island Harbor is the protected body of water between City Island and Hart Island in the Bronx, New York City, open to Long Island Sound at its northern and southern extremities. It is not a true harbor, but a sound. Other minor islands in and around City Island Harbor include the Chimney Sweeps Islands, the Blauzes, and Rat Island. Green Flats Reef is exposed at low tide.
Cuban Ledge is a reef or islet composed chiefly of sand and small rocks in Eastchester Bay, the Bronx, in Long Island Sound. It is located between Rodman's Neck and Country Club in Eastchester Bay and is visible only during periods of low tide. It is a hazard to boats, and is marked with a signal tower.
Mussel Rock is a rock formation on the coast of San Mateo County, California, offshore from Daly City. It consists of one large and numerous smaller rocks of a type known as a stack, where a headland is eroded unevenly, leaving small islands. The rock itself is located 15 meters from the shore of Mussel Rock Park and stands 18 meters tall.
Built for the French Line, Antilles was a near-sister to SS Flandre of 1952. Her construction was completed and her maiden voyage made in 1953. She differed from her sister mainly because she was painted white. She was placed on West Indies cruise service in the 1960s.
The Seven Stones reef is a rocky reef nearly 15 miles (24 km) west of Land's End, Cornwall and 7 miles (11 km) east-northeast of the Isles of Scilly. The reef consists of two groups of rocks and is nearly 2 miles (3.2 km) long and 1 mile (1.6 km) in breadth. They rise out of deep water and are a navigational hazard for shipping with 71 named wrecks and an estimated 200 shipwrecks overall. The most infamous is the Torrey Canyon in 1967, which was at that time the world's costliest shipping disaster and, to date, still the worst oil spill on the coast of the United Kingdom.
Snake Island is a small, uninhabited, rocky island northeast of Nanaimo. It is a minor member of the large group of islands east of southern Vancouver Island called the Gulf Islands. It is a bird sanctuary, and home to a colony of harbour seals. The island is a frequent destination for local wildlife tours, and the rocky shores and reefs around the island are popular with divers. Local seals have become accustomed to divers in the water, and will interact withthem. The Island may get its name from the image of a snake’s head that appears in the coastal rocks at low tide.
The Davenport Tide Pools are located just past the town of Davenport, California in the United States. They are located where Davenport Landing Road loops to the sea off Highway 1. Parallel ridges running perpendicular to the sea separate the tide pools from each other and make them unique, producing communities in which organisms which normally could not live in close proximity to each other can do so. The beach is day use only, open sunrise to sunset.
Patchogue Bay is a lagoon on the south-central shores of Long Island in the U.S. state of New York.
Cape Town lies at the south-western corner of the continent of Africa. It is bounded to the south and west by the Atlantic Ocean, and to the north and east by various other municipalities in the Western Cape province of South Africa.
Shark River Reef is an artificial reef located in the Atlantic Ocean, 15.6 miles southeast of Manasquan Inlet, off of the coast of Ocean County, New Jersey. The site contains almost 4 million cubic yards of dredge rock material. Although 96% of the total reef material is rock, the site also contains numerous subway cars.
The Carr is a sandstone reef on the headland between the Firth of Forth and St Andrews Bay. There have been many ships wrecked on the reef, which lies on the busy shipping lanes into the Forth ports and the River Tay.
Mussel Island was an island in Newtown Creek located near its confluence with Maspeth Creek, between the Brooklyn neighborhood of Greenpoint and the Queens neighborhood of Maspeth in New York City.
Middle Ground is a large submerged reef in Long Island Sound and part of the city of New Rochelle, Westchester County, New York. This underwater embankment formed from the natural accumulation of rock and sand in shallow coastal waters. Rock outcrops just below the surface at the center of Middle Ground become exposed during low tide. Stripers and Bluefish are attracted to the shoal throughout the warmer season.
The Fox Islands Passes are waterways in the Fox Islands area of the U.S. state of Alaska, connecting the Bering Sea with the North Pacific Ocean.
The removal of obstructive rocks from Hell Gate, a narrow tidal strait in New York City's East River and a major water transportation route, began in 1849, when French engineer Benjamin Maillefert, cleared some of the rocks. Then in 1851, the U.S. Army Corps of Engineers, led by General John Newton, began to do the job, in an operation which was to span 70 years. On September 24, 1876, the Corps used 50,000 pounds (23,000 kg) of explosives to blast the rocks, which was followed by further blasting. The process was started by excavating under Hallets reef from Astoria. Cornish miners, assisted by steam drills, dug galleries under the reef, which were then interconnected. They later drilled holes for explosives. A patent was issued for the detonating device. After the explosion, the rock debris was dredged and dropped into a deep part of the river. This was not repeated at the later Flood Rock explosion.
Baktriana Reef is the 360 m long in east-west direction and 40 m wide flat and rocky low-tide elevation off the west coast of Snow Island in the South Shetland Islands, Antarctica. Its surface area is 0.33 ha. The vicinity was visited by early 19th century sealers.
Ballestilla Reef is the 160 m long in southeast–northwest direction and 40 m wide flat and rocky low-tide elevation off the northwest coast of Snow Island in the South Shetland Islands, Antarctica. Its surface area is 0.38 ha. The vicinity was visited by early 19th century sealers.
