 Hasselwood Rock visible as breaking waves to the north of Rockall | |
  Hasselwood Rock | |
| Geography | |
|---|---|
| Location | North Atlantic |
| Coordinates | 57°35′58″N13°41′19″W / 57.59944°N 13.68861°W Coordinates: 57°35′58″N13°41′19″W / 57.59944°N 13.68861°W |
| Area | 300 m2 (3,200 sq ft) |
| Highest elevation | 1 m (3 ft) |
| Administration | |
Hasselwood Rock is a skerry adjacent to Rockall in the North Atlantic.
The upper part of Hasselwood Rock is the destroyed cone of an extinct volcano, 200 metres (656 feet) north of the larger outcrop of Rockall. [1]
The rock is approximately 1 metre (3 ft 3 in) above low water, and 13 metres (43 ft) in diameter, with an area of approximately 130 square metres (1,400 sq ft). It is covered at high tide and in heavy seas, often only visible as breaking waves. There are no sources of fresh water on the rock, which is uninhabitable. The only other rocks in the area, those of Helen's Reef, are almost 2 kilometres (1.2 mi) to the north-east.
Expeditions and landings have not been reported. The geological composition is unknown. [1]
Rockall is an uninhabitable granite islet situated in the North Atlantic Ocean. The United Kingdom claims that Rockall lies within its exclusive economic zone (EEZ) and is part of its territory, but this claim is not recognised by the Republic of Ireland. It and the nearby skerries of Helen's reef are the only emergent parts of the Rockall Plateau. The rock was formed by magmatism as part of the North Atlantic Igneous Province during the Paleogene.
Dartmouth Dam is a large rock-fill embankment dam with an uncontrolled chute spillway across the Mitta Mitta, Gibbo, and Dart rivers, the Morass Creek and a number of small tributaries. The dam is located near Mount Bogong in the north-east of the Australian state of Victoria. The dam's purpose includes irrigation, the generation of hydro-electric power, water supply and conservation. The impounded reservoir is called Dartmouth Reservoir, sometimes called Lake Dartmouth. The Dartmouth Power Station, a hydro-electric power station that generates power to the national grid, is located near the dam wall.
A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as vrtače and shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet. A cenote is a type of sinkhole that exposes groundwater underneath. A sink or stream sink are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock.
The Shag Rocks are six small islands in the westernmost extreme of South Georgia, 240 km (150 mi) west of the main island of South Georgia and 1,000 km (620 mi) off the Falkland Islands. The Shag Rocks are located at 53°32′51″S42°01′12″W. 16 kilometres (9.9 mi) further southeast is Black Rock, which is located at 53°38′06″S41°46′30″W.
Ball's Pyramid is an erosional remnant of a shield volcano and caldera lying 20 kilometres (12 mi) southeast of Lord Howe Island in the Pacific Ocean. It is 562 metres (1,844 ft) high, while measuring 1,100 metres (3,609 ft) in length and only 300 metres (984 ft) across, making it the tallest volcanic stack in the world. Ball's Pyramid is part of the Lord Howe Island Marine Park in Australia and is over 643 kilometres (400 mi) northeast of Sydney, New South Wales.
SSNorge was a transatlantic ocean liner that was launched in 1881 in Scotland for Belgian owners, sold in 1889 to Danish buyers and lost in 1904 off Rockall with great loss of life. Her final voyage was from Copenhagen, Kristiania and Kristiansand, bound for New York, carrying passengers many of whom were emigrants. It was the biggest civilian maritime disaster in the Atlantic Ocean until the sinking of Titanic eight years later, and is still the largest loss of life from a Danish merchant ship.
The Tunnel of Eupalinos or Eupalinian aqueduct is a tunnel of 1,036 m (3,399 ft) length running through Mount Kastro in Samos, Greece, built in the 6th century BC to serve as an aqueduct. The tunnel is the second known tunnel in history which was excavated from both ends, and the first with a geometry-based approach in doing so. Today it is a popular tourist attraction.
The Manacles are a set of treacherous rocks off The Lizard peninsula in Cornwall. The rocks are rich in marine wildlife and they are a popular spot for diving due to the many shipwrecks. Traditionally pronounced mean-a'klz (1808), the name derives from the Cornish meyn eglos, the top of St Keverne church spire being visible from the area.
The white ghost catshark is a shark of the catshark family Scyliorhinidae found in deep water in the northeast Atlantic between latitudes 57°N and 58°N. A deep-water catshark known from the eastern North Atlantic from depths of 1,014 to 1,800 m, it is known from only a limited number of specimens. It reaches a maximum of 54 cm or 1.7 ft total length which is a medium size for the Apristurus genus.
The Rockall Trough is a deep-water bathymetric feature to the northwest of Scotland and Ireland, running roughly from southwest to northeast, flanked on the north by the Rockall Plateau and to the south by the Porcupine Seabight. At the northern end, the channel is bounded by the Wyville-Thomson Ridge, named after Charles Wyville Thomson, professor of zoology at the University of Edinburgh and driving force behind the Challenger Expedition. At the southern end, the trough opens into the Porcupine abyssal plain. The Rockall Basin is a large sedimentary basin that lies beneath the trough. Both are named after Rockall, a rocky islet lying 301.4 km west of St Kilda.
Lot's Wife is a volcanic, deserted island located in the Philippine Sea approximately 650 kilometres (400 mi) south off the coast of Tokyo, at the southernmost tip of the Izu archipelago, Japan. Though only 0.01 km2 in area, it reaches almost 100 meters in height.
Split Rock Dam is a minor ungated concrete faced rock fill embankment dam with concrete chute spillway across the Manilla River upstream of Manilla in the north-western slopes region of New South Wales, Australia. The dam's purpose includes flood mitigation, irrigation, water supply and conservation. The impounded reservoir is called Split Rock Reservoir.
Pindari Dam is a minor concrete faced rockfill embankment dam with an ungated uncontrolled rock cut with concrete sill spillway across the Severn River located upstream of the town of Ashford, in the North West Slopes region of New South Wales, Australia. The dam's purpose includes flood mitigation, hydro-power, irrigation, water supply and conservation. The impounded reservoir is called Lake Pindari.
Chaffey Dam is a minor ungated rock fill with clay core embankment dam with an uncontrolled morning glory spillway across the Peel River, located upstream of the city of Tamworth, in the New England region of New South Wales, Australia. The dam's purpose includes flood mitigation, irrigation, water supply, and water conservation.
The Anton Dohrn Seamount is a guyot in the Rockall Trough in the northeast Atlantic. It is 1.8 kilometres (1.1 mi) high and is topped with pinnacles, one of which reaches a depth of 530 metres (1,740 ft). Away from the flat top upon which the pinnacles rest, the slopes fall off steeply into the Rockall Trough and a moat in the sediment that surrounds the seamount.
The habitat of deep-water corals, also known as cold-water corals, extends to deeper, darker parts of the oceans than tropical corals, ranging from near the surface to the abyss, beyond 2,000 metres (6,600 ft) where water temperatures may be as cold as 4 °C (39 °F). Deep-water corals belong to the Phylum Cnidaria and are most often stony corals, but also include black and thorny corals and soft corals including the Gorgonians. Like tropical corals, they provide habitat to other species, but deep-water corals do not require zooxanthellae to survive.
Rosemary Bank is a seamount approximately 120 kilometres (75 mi) west of Scotland, located in the Rockall Trough, in the northeast Atlantic. It was discovered in 1930 by the survey vessel HMS Rosemary, from which it takes its name. It is one of only three seamounts known in Scottish waters.
Toonumbar Dam is a minor ungated rock fill with clay core embankment dam with a concrete chute spillway across the Iron Pot Creek north-west of Casino in the Northern Rivers region of New South Wales, Australia. The dam's purpose includes hydro-power, irrigation, water supply, and conservation. The impounded reservoir is called Lake Toonumbar.
Helen's Reef is a series of skerries in the North Atlantic, 2 kilometres northeast of the larger islet of Rockall and outcrop of Hasselwood Rock, within the United Kingdom's exclusive economic zone. The skerries are covered at high tide or in rough seas, and are often only visible as breaking waves.
 | Wikimedia Commons has media related to Hasselwood Rock . |
