A ria (/riːə/ or /riə/)[1] is a coastal inlet formed by the partial submergence of an unglaciated river valley. It is a drowned river valley that remains open to the sea. Typically, rias have a dendritic, treelike outline although they can be straight and without significant branches. This pattern is inherited from the dendritic drainage pattern of the flooded river valley. The drowning of river valleys along a stretch of coast and formation of rias results in an extremely irregular and indented coastline. Often, there are naturally-occurring islands, which are summits of partly submerged, preexisting hill peaks. (Islands may also be artificial, such as those constructed for the Chesapeake Bay Bridge-Tunnel.)

A ria coast is a coastline having several parallel rias separated by prominent ridges, extending a distance inland.[2][3][4] The sea level change that caused the submergence of a river valley may be either eustatic (where global sea levels rise), or isostatic (where the local land sinks). The result is often a very large estuary at the mouth of a relatively insignificant river (or else sediments would quickly fill the ria). The Kingsbridge Estuary in Devon, England, is an extreme example of a ria forming an estuary disproportionate to the size of its river; no significant river flows into it at all, only a number of small streams.[4]

Georges River, in the southern suburbs of Sydney, Australia, is a ria, or drowned river valley. The deeply indented shape of the ria reflects the dendritic pattern of drainage that existed before the rise in sea level that flooded the valley.


The word ria comes from Portuguese ria or Galician ría, which is related to Spanish and Galician río and Portuguese rio (river). Rias are present all along the Galician coast in Spain. As originally defined, the term was restricted to drowned river valleys cut parallel to the structure of the country rock that was at right angles to the coastline. However, the definition of ria was later expanded to other flooded river valleys regardless of the structure of the country rock.

For a period of time, European geomorphologists[5] regarded rias to include any broad estuarine river mouth, including fjords. These are long, narrow inlets with steep sides or cliffs, created in a valley carved by glacial activity. In the 21st century, however, the preferred usage of ria by geologists and geomorphologists is to refer solely to drowned unglaciated river valleys. It therefore excludes fjords by definition, since fjords are products of glaciation.[2][3][4]



Land of Galicia, NASA satellite image
A satellite view of Galicia




Tory Channel Marlborough Sounds
Tory Channel, in New Zealand's Marlborough Sounds

North America

South America


Ria can amplify the effects of tsunami, as demonstrated in the seismicity of the Sanriku coast, most recently in the 2011 Tōhoku earthquake and tsunami.

See also


  1. ^ "ria". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
  2. ^ a b Cotton, C.A. (1956). "Rias Sensu Stricto and Sensu Lato". The Geographical Journal. 122 (3): 360–364. doi:10.2307/1791018.
  3. ^ a b Goudie, A. (2004) Encyclopedia of Geomorphology. Routledge. London, England.
  4. ^ a b c Bird, E.C.F. (2008) Coastal Geomorphology: An Introduction, 2nd ed. John Wiley and Sons Ltd. West Sussex, England.
  5. ^ Gulliver, F.P. (1899). "Shoreline Topography". Proceedings of the American Academy of Arts and Sciences. 34 (8): 151–258. doi:10.2307/20020880.

Further reading

  • Perillo, Gerardo, Geomorphology and Sedimentology of Estuaries, Volume 53. pp. 17–47. Elsevier Science (1995) ISBN 9780080532493
  • von Richthofen, F. Fuhrer fur Forschungsreisende ("Guide for Explorers"), pp. 308–310. Berlin, Oppenheim (1886)
Astro Ria

Astro Ria is Malaysian pay television network exclusive to the Astro satellite television provider. It was one of the first 22 channels to be launched on Astro in 1996.

Programs on the network include Malay dramas, films and reality shows.

In 2003, Astro Ria launched a show based from Mexican TV series La Academia, called Akademi Fantasia. The contest pits 12 singers in a bid to become the winner. The show became so popular in Malaysia and Brunei that spin-off versions were made in Indonesia and Thailand. A second season was made, which enabled Brunei viewers to vote as well. In its third season, 14 contestants instead of the original 12 were competing for the competition and the winner, Mawi became an instant music celebrity. A fourth season started in May 2006.

In May 2002, Astro Ria launched Bloomberg RIA News, which was essentially the Malay language version of Bloomberg News Malaysia. The news was aired at 10:45pm, for fifteen minutes on weekdays. Its first anchor was Amir Mahmood Razak, who eventually also presented for the English version. The show was produced by Amy Mahadi.

Bloomberg TV and Astro's co-operation was dissolved in 2004, and the news programming became known as Berita Astro. Berita Astro ceased production at the end of January 2007 and later launched a new news division, in which Astro Awani was launched in September 2007. Its main news programme Awani 7:45 was also simulcasted on this channel every day at 19:45 MST.

Bà Rịa

Bà Rịa (Vietnamese: [ɓaː˧˩ riə˧˨˧ˀ] (listen)) is a city in Bà Rịa–Vũng Tàu Province in the Southeast region of Vietnam. Bà Rịa is split from Vũng Tàu by a river crossed by Co May Bridge.

This is the de jure seat of the province since most of the provincial administration agencies are located here. Bà Rịa officially became the provincial capital of Bà Rịa–Vũng Tàu from May 2, 2012, replacing Vũng Tàu in that role.

Bà Rịa-Vũng Tàu Province

Bà Rịa-Vũng Tàu (Hanoi accent: [ɓa˨˩ ziə˨˧ vuŋm˧ˀ˥ taːw˨˩] (listen), Saigon accent: [ɓa˨˩ riə˨˧ vuŋm˧˩˧ taːw˨˩] (listen)) is a province of Vietnam. It is located on the coast of the country's Southeast region. It also includes the Côn Đảo islands, located some distance off Vietnam's southeastern coast. From 1954 to 1975, this province belonged to South Vietnam with the name Phước Tuy.

Côn Đảo

The Côn Đảo Islands are an archipelago of Bà Rịa–Vũng Tàu Province, in the Southeast region of Vietnam, and a district of this province.

Leopoldo Calvo-Sotelo

Leopoldo Ramón Pedro Calvo-Sotelo y Bustelo, 1st Marquess of Ría de Ribadeo (Spanish pronunciation: [leoˈpoldo ˈkalβosoˈtelo i βusˈtelo]; 14 April 1926 – 3 May 2008), known as Leopoldo Calvo-Sotelo was Prime Minister of Spain between 1981 and 1982.

Long Điền District

Long Điền is a rural district of Bà Rịa–Vũng Tàu Province in the southeast region of Vietnam. As of 2003, the district had a population of 118,862. The district covers an area of 77 km². The district capital lies at Long Điền.

Monsoon Wedding

Monsoon Wedding is a 2001 drama film directed by Mira Nair and written by Sabrina Dhawan. The film stars Naseeruddin Shah, Lillete Dubey, Shefali Shah and Vasundhara Das. The story depicts romantic entanglements during a traditional Punjabi Hindu wedding in Delhi. Dhawan wrote the first draft of the screenplay in a week while she was at Columbia University's MFA film program. Although it is set entirely in New Delhi, the film was an international co-production between companies in India, the United States, Italy, France, and Germany.

Monsoon Wedding earned above $30 million at the box office. The film won the Golden Lion award and received a Golden Globe Award nomination. A musical based on the film was in development and was premiered on Broadway in April 2014. The film was premiered in the Marché du Film section of the 2001 Cannes Film Festival. In 2017, IndieWire named it the best romance of the 21st century.

Phú Mỹ (town)

Phú Mỹ is a district-level town of Bà Rịa–Vũng Tàu Province in the southeast region of Vietnam. In 2018, Tân Thành District became Phú Mỹ Town. As of 2018 the district-level town had a population of 175,872. The town covers an area of 333.84 km².

The town seat is Phú Mỹ ward. Phú Mỹ is a highly industrialized town with several industrial parks. Phú Mỹ is home to deep water ports replacing Saigon Port when the latter has been relocated here. Phú Mỹ Power Plant Complex with total capacity of 4,000 MW contributes nearly 35% of Vietnam's total electricity.

RIA Novosti

RIA Novosti (Russian: РИА Новости), sometimes RIA (Russian: РИА) for short, was Russia's international news agency until 2013 and continues to be the name of a state-operated domestic Russian-language news agency. Operating under the purview of the Russian Ministry of Communications and Mass Media, RIA Novosti is headquartered in Moscow and operated about 80 bureaus internationally. On 9 December 2013 President of Russia Vladimir Putin ordered RIA Novosti's liquidation and the creation of a Russian international news agency Rossiya Segodnya. Dmitry Kiselev, an anchorman of the Russia-1 channel was appointed to be the first president of the new information agency. RIA Novosti was scheduled to be closed down in 2014; starting in March 2014, staff were informed that they had the option of transferring their contracts to Rossiya Segodnya or accepting voluntary redundancy. On 10 November 2014, Rossiya Segodnya launched the Sputnik multimedia platform as the international replacement of RIA Novosti and Voice of Russia. Within Russia itself, however, Rossiya Segodnya continues to operate its Russian language news service under the name RIA Novosti with its ria.ru website.The agency published news and analysis of social-political, economic, scientific and financial subjects on the Internet and via e-mail in the main European languages, as well as in Persian, Japanese and Arabic. It had a correspondent network in the Russian Federation, CIS and over 40 non-CIS countries. Its clients include the presidential administration, Russian government, Federation Council, State Duma, leading ministries and government departments, administrations of Russian regions, representatives of Russian and foreign business communities, diplomatic missions, and public organizations.RIA Novosti was an award-winning news agency. The last editor-in-chief of RIA Novosti was Svetlana Mironyuk, the first woman appointed to the role in the agency's history. According to the organisation's Charter, enterprise's property was federally owned (because federal unitary enterprise) and was indivisible. According to the agency, it was partially government-subsidized (2.7–2.9 billion roubles in 2013), but maintained full editorial independence.Its Russian name was Federal State Unitary Enterprise Russian Agency of International Information «RIA Novosti» (Russian: Федеральное государственное унитарное предприятие Российское агентство международной информации «РИА Новости», Federal'noye Gosudarstvennoye Unitarnoye Predpyatye Rossiyskoye Agentsvo Mezhdunarodnoy Informatsii), FGUP RAMI «RIA Novosti» (Russian: ФГУП РАМИ «РИА Новости») for short. Its formal English name was Russian News & Information Agency "RIA Novosti". Early in 1990s it had the name state enterprise RIA «Novosti» (named after Soviet Press Agency «Novosti» and Information Agency «Novosti»). RIA means Russian Information Agency and Novosti means News in Russian. The common abbreviation in Russian is RIA.


A radioimmunoassay (RIA) is an immunoassay that uses radiolabeled molecules in a stepwise formation of immune complexes. A RIA is a very sensitive in vitro assay technique used to measure concentrations of substances, usually measuring antigen concentrations (for example, hormone levels in blood) by use of antibodies.

Although the RIA technique is extremely sensitive and extremely specific, requiring specialized equipment, it remains among the least expensive methods to perform such measurements. It requires special precautions and licensing, since radioactive substances are used.

In contrast, an immunoradiometric assay (IRMA) is an immunoassay that uses radiolabeled molecules but in an immediate rather than stepwise way.

A radioallergosorbent test (RAST) is an example of radioimmunoassay. It is used to detect the causative allergen for an allergy.


Ria-Sirach (Catalan: Rià i Cirac) is a commune in the Pyrénées-Orientales department in southern France.

Ria Baran

Ria Baran (2 November 1922 in Dortmund, Germany – 12 November 1986) was a German pair skater. She skated together with Paul Falk and twice became World champion and in 1952 Olympic champion. She was one of the oldest female figure skating Olympic champions.

Ria Baran married Paul Falk during her active international figure skating. Therefore she is sometime listed as Ria Baran-Falk or Ria Falk.

The pair skated for the club Düsseldorfer EG and had no coach. Until 1951 Ria Baran and Paul Falk were not able to participate in international competitions because Germany was excluded from the international sport after World War II. They were the first couple which performed side by side double jumps and they also invented the Lasso-Lift.

Baran and Falk were never defeated in amateur competition.

Between 1950 and 1952 Ria Baran was voted 3 times running as the female athlete of the year in Germany.

After winning the Olympics in 1952 they turned pro and worked for Holiday on Ice.

Baran later worked as a secretary.

Ria Oomen-Ruijten

Ria Oomen-Ruijten (born 6 September 1950 in Echt, Limburg) is a Dutch politician of the Christian Democratic Appeal (CDA). Since 9 June 2015, she has been a member of the Senate.

Oomen is a former Member of the European Parliament. As a MEP, she was a member of the bureau of the European People's Party (Christian Democrats) group, she was a member of the European Parliament's Committee on Foreign Affairs, and a substitute member of the Committee on Employment and Social Affairs.

Previously, she was a member of the House of Representatives (June 1981 – September 1989). She dealt mainly with social affairs.

From May 1985, she was chair of The Dutch Foundation for Consumer Complaints Boards (De Geschillencommissie). The Foundation deals with consumer complaints and complaints between enterprises. From January 2013 Hein Blocks succeeded her as chair.

Ria Percival

Ria Dawn Percival (born 7 December 1989) is a New Zealand professional women's footballer who plays as a defender for Tottenham Hotspur in the FA WSL and the New Zealand national team. She previously played for FFC Frankfurt and FF USV Jena of the Bundesliga, FC Basel in the Swiss league and West Ham United.

Taman Pertama MRT station

Taman Pertama MRT station is a mass rapid transit (MRT) station on the MRT Sungai Buloh-Kajang Line (SBK Line) in Cheras constituency, Kuala Lumpur, Malaysia. It is located along the Cheras Highway , just right next to where it branches to Loke Yew Highway and Jalan Cheras. It opened on 17 July 2017, along with 18 adjoining stations as part of Phase Two of the MRT system.

Taman Pertama station was provisionally known as Taman Bukit Ria during construction. This is the first elevated station (towards Kajang) after exiting the underground section at Maluri.

Vũng Tàu

Vũng Tàu (Hanoi accent: [vuŋm˧ˀ˥ taːw˨˩] (listen), Saigon accent: [vuŋm˧˩˧ taːw˨˩] (listen)) is the largest city and former capital of Bà Rịa–Vũng Tàu Province in Vietnam. The city area is 140 square kilometres (54 square miles), consists of thirteen urban wards and one commune of Long Son Islet. Vũng Tàu was the capital of the province until it was replaced by the much smaller Bà Rịa city on 2 May 2012. The city is also the crude oil extraction center of Vietnam.

Xuyên Mộc District

Xuyên Mộc is a rural district of Bà Rịa–Vũng Tàu Province in the southeast region of Vietnam. As of 2003 the district had a population of 132,117. The district covers an area of 642 km².This city is home to primitive forest in which there exists a significant elephant population. Xuyen Moc is noted for its hot spring in Bình Châu - Phước Bửu natural reserve which is available for tourists. Xuyen Moc is located by the South China Sea and is famous for its white sand, unspoilt beaches and delicious seafood which provides tourists with authentic experiences of Vietnam coastal life. The most famous beaches in the area are Ho Tram Beach, which is starting to see numerous new high end developments come up including The Grand Ho Tram Strip (formerly known as MGM Ho Tram Casino & Resort) and several additional private developments along the main Hồ Tràm Beach. Hồ Cốc beach nearby is also home to pristine seas and beautiful natural surroundings and make for popular week-end escapes for Ho Chi Minh City residents.

Đất Đỏ District

Đất Đỏ is a rural district of Bà Rịa–Vũng Tàu Province in the Southeast region of Vietnam. As of 2003, the district had a population of 62,683. The district covers an area of 190 km². The district capital lies at Phước Hải.This district is the home area of the prominent communist Võ Thị Sáu.



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