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(yä`nōs), Spanish American term for prairies, specifically those of the Orinoco River basin of N South America, in Venezuela and E Colombia. The llanos of the Orinoco are a vast, hot region of rolling savanna broken by low-lying mesas, scrub forest, and scattered palms. Elevation above sea level never reaches more than a few hundred feet. During the dry season (November to April) the land is sear, the grass brown, brittle, and inedible; during the rainy season much of the area is inundated. The region is subject to insect plagues. The sparsely populated llanos support a pastoral economy; cattle raising is dominant. With flood control and water storage projects in the region, sections of the llanos have been turned into fertile agricultural land. Oil has been found there. Ciudad Bolívar and San Fernando de Apure are the chief cities of the region. The llanero, an expert horseman comparable to the gaucho of the Argentine pampas, is of mixed Spanish, indigenous, and black African stock. The llanero has played an important role in Venezuelan history as an ardent henchman of successive revolutionary caudillos, notably José Antonio PáezPáez, José Antonio
, 1790–1873, Venezuelan revolutionist, president, and caudillo. He boldly led (1810–19) a band of llaneros [plainsmen] in skillful guerrilla warfare against the Spanish, aided Simón Bolívar at the battle of
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(1) The name of some plains areas in regions of Spanish colonization, such as Llano Estacado in the USA and Llanos del Orinoco and Llanos de Mojos in South America.

(2) A type of savanna, mainly of high grass, in the Orinoco plains. The grass is dense, and there are individual trees or groups of trees (usually the Mauritia palm). There are fringing forests along the rivers. The name “llano” is sometimes also used in referring to other herbaceous (grassy) formations in South America.

References in periodicals archive ?
Park, Chief Executive Officer of GeoPark, said, "Congratulations to our team who continue to find oil on our Colombian Llanos 34 Block -- with Chachalaca being our seventh oil field discovery since we entered the block in 2012.
They are implicated in multiple homicides and a network of important narco-paramilitarism," said Venezuelan Interior and Justice Minister Tareck El Aissami The family of Martin Llanos were commanders and founding members of paramilitary group the ACC, a group of the now-demobilized paramilitary umbrella organization AUC.
The Estrada ranch is one of many that blanket the llanos, but it carries an unusual distinction: It was nicknamed after Dona Barbara, one of Latin America's literary classics.
To understand about Llanos basin being the most important heavy oil basin in Colombia
The Llanos 34 Block represented 93% of GeoPark's Colombian production in 2Q2015.
Open Solutions' technical expertise is outstanding," said Llanos.
Park, Chief Executive Officer of GeoPark, said, "Congratulations to our team who continue to find oil in our Colombian Llanos 34 Block -- with Tilo being our sixth oil field discovery.
Bodegas Dehesa de Los Llanos and its Mazacruz (Tierra de Castilla) range of wines are available in the US market for the first time in both red and white varieties.
The Cao Caranal Block is also located in the Llanos Basin of Colombia and contains numerous seismically-defined leads and prospects for possible future drilling.
Llanos & Asociados was established in 1993 and over the past four years has become one of the premier distributors in Spain.
In the Cano Caranal Association Contract, held 50/50 with the Operator, Mohave Colombia Corporation, preliminary seismic operations are underway on a 50-kilometer 2-D survey on the "N" structure to delineate a drilling location for an exploratory well to also be drilled when the dry season in the Llanos begins.
The well is planned to be drilled in December 1994 on the company's 350,000 acre Alcaravan contract in the Llanos Basin.