* reef knot — joining two ends of a single line to bind around an object

It is one of the four basic maritime knots ( the other three are figure-eight knot, reef knot and clove hitch ).

The overhand knot is one of the most fundamental knots and forms the basis of many others including the simple noose, overhand loop, angler's loop, reef knot, fisherman's knot and water knot.

It is considered inferior to the reef knot, which it superficially resembles.

When attempting to tie a reef knot, it is easy to produce a granny knot accidentally.

A tightened granny knot can also jam and is often more difficult to untie than the reef knot.

It is better to tie a reef knot in nearly all circumstances.

One way to distinguish them is that in the reef knot each loop passes completely over, or completely under ( not through ) the neck of the other.

The reef knot is commonly taught as left over right, tuck under then right over left, tuck under.

This is a very common mistake made by people learning to tie a reef knot.

In situations where the object leaves gaps under the knot and there are no corners, it is possible to finish the constrictor knot off with an additional overhand knot, in the fashion of a reef knot, to help stabilize it.

# REDIRECT reef knot

The Thief knot resembles the reef knot except that the free, or working, ends are on opposite sides.

If another sailor went through the bag, the odds were high the thief would tie the bag back using the more common reef knot, revealing the tampering, hence the name.

The thief knot is much less secure than the already insecure reef knot.

This fringing seaward reef shelf comprises an area of approximately 13. 61 square miles ( 35. 2 km < sup > 2 </ sup >).

The name " square knot " is found in Dana's 1841 maritime compendium A Seaman's Friend, which also gives " reef knot " as an alternate name.

Biosphere 2 contained representative biomes: a 1, 900 square meter rainforest, an 850 square meter ocean with a coral reef, a 450 square meter mangrove wetlands, a 1, 300 square meter savannah grassland, a 1, 400 square meter fog desert, a 2, 500 square meter agricultural system, a human habitat, and a below-ground level technical infrastructure.

A slip knot ( vs. a simple reef or square knot ) will give way if the neckerchief gets caught and is thus more likely to choke the wearer.

The Mascarene Islands are surrounded by approximately 750 square km of coral reef.

When tying the half-knots, a right-over-left half knot followed by a left-over-right half knot ( or vice versa ) forms a square or reef knot, a fairly effective knot for the purpose of tying shoelaces.

It is a more secure replacement for the reef knot ( square knot ), especially in its doubled variety.

From two tiny outcrops on a reef, the island was enlarged and transformed into an island holiday resort of 85, 000 square metres.

It measures almost eleven kilometres ( north – south ) by more than four kilometres ( east – west ), with a total area of 36. 8 square kilometres, including the lagoon of 8. 5 km², the difference being accounted for the mostly by the reef flat.

The reef area is 51, 020 square kilometers.

The Philippines, with more than 7, 000 islands and warm ocean waters, surround about 26, 000 square kilometers of coral reef.

While the diver seeks out colonies of abalone amongst the reef beds the deckhand operates the boat, known as working " live " and stays above where the diver is working.

Divers measure each abalone before removing from the reef and each and every piece is re-measured by the deckhand as well as removing excess weed growth from the shell.

The precise formation mechanism is not known for certain, but the most widely accepted hypothesis suggests that the edge of the Cathedral Formation reef became detached from the rest of the reef, slumping and being transported some distance — perhaps kilometers — away from the reef edge.

The terrain is low-lying and sandy: a coral island surrounded by a narrow fringing reef with a depressed central area devoid of a lagoon with its highest point being above sea level.

The narrow fringing reef surrounding the island can be a maritime hazard, so there is a day beacon near the old village site.

The reef rim averages around 100 m across and completely encloses a shallow lagoon that has a maximum depth of 15 m. Its Exclusive Economic Zone ( EEZ ) of is contiguous with that of Europa Island.

Those on the north and east sides are 2. 1 to 3 m high, and those on the west and south sides 1. 2 m The reef is completely covered by the sea from 3 hours before to 3 hours after high tide.

The reef surrounding Clipperton is exposed at low tide.

Quita Sueño Bank is claimed by the United States to be a submerged reef, and thus does not recognize the sovereignty of any nation over the bank.

A coral reef lies close to shore ; the island's capital of Mutsamudu is also its main port.

The coral reef surrounding the seaward side of the atoll is generally broad, flat, and shallow at about below mean sea level in most locations and varying from 300 to 650 feet ( 100 to 200 m ) in width.

It is surrounded by coral beaches and a fringing reef and encloses a mangrove lagoon of around 9 km².

The terrain is low-lying and sandy: a coral island surrounded by a narrow fringing reef with a slightly raised central area.

An atoll is an island formed from a coral reef that has grown on an eroded and submerged volcanic island.

Behind the beaches is a flat raised plain of uplifted coral reef.

The low-lying coral island has long been noted as hard to sight from small ships and is surrounded by a narrow fringing reef.

The atoll, which is located on the coral reef platform, comprises four islands.

Kingman Reef () is a largely submerged, uninhabited triangular shaped reef, east-west and north-south, located in the North Pacific Ocean, roughly half way between the Hawaiian Islands and American Samoa at.

The total area within the outer rim of the reef is.

The highest point on the reef is less than above sea level, which is wetted or awash most of the time, making Kingman Reef a maritime hazard.

The percentage of the total fish biomass on the reef is made up of 85 % apex predators, creating a high level of competition for food and nutrients among local organisms — particularly sharks, jacks, and other carnivores.

Above sea level, the reef is usually barren of macroorganisms, however.