Question: Along which river is the city in which The El Pinar Zoo is located ?

Context paragraphs:
Columbus Zoo and Aquarium: The Columbus Zoo and Aquarium is a non-profit zoo located near Powell in Liberty Township, Delaware County, Ohio, United States, north of the city of Columbus.  The land lies along the eastern banks of the O'Shaughnessy Reservoir on the Scioto River, at the intersection of Riverside Drive and Powell Road.  It has a worldwide reputation, largely attributable to the efforts and promotion of director emeritus Jack Hanna.  In 2009, it was named by the USA Travel Guide as the number one zoo in the United States.  It was also ranked number one best zoo in 2012 by Besties Readers Choice.

Taronga Zoo: Taronga Zoo is the city zoo of Sydney, New South Wales, Australia and is located on the shores of Sydney Harbour in the suburb of Mosman.  It was officially opened on 7 October 1916.  Taronga Zoo is managed by the Zoological Parks Board of New South Wales, under the trading name Taronga Conservation Society, along with its sister zoo, the Taronga Western Plains Zoo in Dubbo.

Valverde, Santa Cruz de Tenerife: Valverde (Spanish meaning "green valley") is a municipality in the Canary Islands in the province of Santa Cruz de Tenerife.  It is located on the north-east part of El Hierro (the rest of the island being the municipalities of Frontera and El Pinar).  The town of the same name serves as the island's official capital.  It is both the smallest Canarian capital and the only one not located by the sea.  The town's airport and seaport are both several kilometres away on the island's east coast.

El Pinar Zoo: The El Pinar Zoo (Spanish: "Parque Zoológico El Pinar" ) Also Zoological Park of El Pinar Is the first zoological garden of Caracas, Venezuela inaugurated the 13 of August of 1945 under the presidency of Isaías Medina Angarita.  El pinar zoo is located in El Paraiso Parish in the former grounds of the La Vaquera hacienda, which was owned by Juan Vicente Gómez.  The State took possession of it in 1935.  It occupies an area of 7 hectares.

El Pinar, Uruguay: El Pinar is a seaside resort of the Canelones Department, Uruguay.  In 1994, when Ciudad de la Costa took on the status of a city, El Pinar was incorporated in it.

Toronto Zoo: The Toronto Zoo is a zoo located in Toronto, Ontario, Canada.  Founded by Hugh A. Crothers, an industrialist who became the first Chairman of the Metro Toronto Zoological Society in 1966, the zoo opened on August 15, 1974 as the "Metropolitan Toronto Zoo", or simply "Metro Toronto Zoo", and is owned by the City of Toronto.  The word "Metropolitan" was dropped from its name when the Municipality of Metropolitan Toronto was amalgamated to the current city in 1998.  The zoo is located near the Rouge River, along the western border of Rouge Park in the city's east end district of Scarborough.

Dar es Salaam Zoo: Dar es Salaam Zoo is a zoological park in Dar es Salaam, Tanzania.  The zoo is located in the Kigamboni-district in the eastern part of the city, 37 km from Downtown Dar es Salaam.  The Dar es Salaam Zoo is best known for having many animals endemic to Tanzania, including but not limited to zebras, crocodiles, antelopes, tortoises, gazelles, monkeys, hyenas, lions, leopards, snakes, and several species of birds.  There is also a kids' zone with slides, swings and jungle-gyms.  The Dar es salaam Zoo also has a swimming pool for children and teenagers under 15.  Dar es salaam Zoo gives an opportunity to foreigners and locals to get close to animals and interact with some animals such as monkeys, horses, donkeys and camels, also providing a dream ride for the visitors.  Nguva river is also one of the biggest attraction of Dar es salaam Zoo, providing water and cool climate for the natural vegetation attracting different species of colourful and uniquely attractive birds, butterflies and other natures beauty creations.  It is one of the largest zoo's in East Africa hence providing its singular taste for both locals and foreigners.

Cajón del Maipo: Cajón del Maipo is a canyon located in the Andean southeastern portion of the Santiago Metropolitan Region, Chile.  It encompasses the upper Maipo River basin, where the river has entrenched itself in a narrow valley.  The zone features a series of confluent rivers such as El Volcán River, Yeso River and Colorado River, as well as other minor streams, including San Gabriel, Manzanito, Coyanco, El Sauce, El Manzano and San José.  The main locality is San José de Maipo, capital of the commune that includes all of the Andean sector of the Metropolitan Region.  The towns located here from the pre-Andean area until well within the Andes mountains are: "La Obra", "Las Vertientes" (the two latter conurbated with the city of Santiago de Chile), "El Canelo", "El Manzano", "Guayacán", "San José de Maipo", "El Melocotón", "San Alfonso", "El Ingenio", "San Gabriel y Melosas", "Los Maitenes", "Alfalfal", "El Romeral", "Queltehues", "El Volcán", "Baños Morales" and "Lo Valdés".

Taronga Western Plains Zoo: Taronga Western Plains Zoo, formerly known as (and still commonly referred to as) Western Plains Zoo and commonly known as Dubbo Zoo, is a large zoo near Dubbo, New South Wales, Australia.  It opened to the public on 28 February 1977, to provide more living and breeding space for large animals such as elephants and antelopes which needed more space than was available at the restricted Sydney site.  The zoo is run by the Taronga Conservation Society (formerly Zoological Parks Board of New South Wales), along with Taronga Zoo.  Western Plains Zoo is located on the Newell Highway in west Dubbo about 4 km from the city.

Caracas: Caracas (] ; ] ), officially Santiago de León de Caracas, is the capital, the center of the Greater Caracas Area, and the largest city of Venezuela.  Caracas is located along the Guaire River in the northern part of the country, following the contours of the narrow Caracas Valley on the Venezuelan coastal mountain range (Cordillera de la Costa).  Terrain suitable for building lies between 760 and 1,140 m (2,490 and 3,740 ft) above sea level.  The valley is close to the Caribbean Sea, separated from the coast by a steep 2,200-metre-high (7,200 ft) mountain range, Cerro El Ávila; to the south there are more hills and mountains.

Supporting paragraphs: El Pinar Zoo Caracas
Answer: the Guaire River