Rivers and lakes

[edit] Rivers and lakes

Sailboats on the Uruguay RiverMajor rivers in Argentina include the Pilcomayo, Paraguay, Bermejo, Colorado, Río Negro, Salado, Uruguay and the largest river, the Paraná. The latter two flow together before meeting the Atlantic Ocean, forming the estuary of the Río de la Plata. Regionally important rivers are the Atuel and Mendoza in the homonymous province, the Chubut in Patagonia, the Río Grande in Jujuy and the San Francisco River in Salta.

There are several large lakes in Argentina, many of them in Patagonia. Among these are lakes Argentino and Viedma in Santa Cruz, Nahuel Huapi in Río Negro and Fagnano in Tierra del Fuego and Colhué Huapi and Musters in Chubut. Lake Buenos Aires and O'Higgins/San Martín Lake are shared with Chile. Mar Chiquita, Córdoba, is the largest salt water lake in the country. There are numerous reservoirs created by dams. Argentina features various hot springs, such as those at Termas de Río Hondo with temperatures between 65°C and 89°C.[18]

The largest oil spill to ever occur in fresh water was caused by a Shell tanker ship in the Rio de la Plata, Magdalena, Argentina, on January 15, 1999, polluting the environment, drinkable water, plants and animals.[19]


[edit] Coastal areas and seas
Argentina has 4,665 kilometres (2,899 mi) of coastline.[20] The continental platform is unusually wide; this shallow area of the Atlantic Ocean is called Mar Argentino. The Argentine Atlantic coast has been a favorite among local vacationers for over a hundred years. The waters are rich in fisheries and suspected of holding important hydrocarbon energy resources. Argentina's coastline varies between areas of sand dunes and cliffs. The two major ocean currents affecting the coast are the warm Brazil Current and the cold Falkland Current. Because of the unevenness of the coastal landmass, the two currents alternate in their influence on climate and do not allow temperatures to fall evenly with higher latitude. The southern coast of Tierra del Fuego forms the north shore of the Drake Passage.


Panoramic view of Bristol Beach in the city of Mar del Plata in winter.

[edit] Climate
Main article: Climate of Argentina

A mild climate typifies the region of the Pampas
The Andean range over the southern province of Santa Cruz.Because of longitudinal and elevation amplitudes, Argentina is subject to a variety of climates. As a rule, the climate is predominantly temperate with extremes ranging from subtropical in the north to subpolar in the far south. The north of the country is characterized by very hot, humid summers with mild drier winters, and is subject to periodic droughts. Central Argentina has hot summers with thunderstorms (western Argentina produces some of the world's largest hail), and cool winters. The southern regions have warm summers and cold winters with heavy snowfall, especially in mountainous zones. Higher elevations at all latitudes experience cooler conditions.

The hottest and coldest temperature extremes recorded in South America have occurred in Argentina. A record high temperature of 49.1 °C (120.4 °F), was recorded at Villa de María, Córdoba, on 2 January 1920. The lowest temperature recorded was −39 °C (−38 °F) at Valle de los Patos Superior, San Juan, on 17 July 1972.

Major wind currents in Argentina include the cool Pampero Winds blowing on the flat plains of Patagonia and the Pampas; following the cold front, warm currents blow from the north in middle and late winter, creating mild conditions. The Zonda, a hot dry wind, affects west-central Argentina. Squeezed of all moisture during the 6,000-meter (20,000 ft) descent from the Andes, Zonda winds can blow for hours with gusts up to 120 km/h (75 mph), fueling wildfires and causing damage; when the Zonda blows (June-November), snowstorms and blizzard (viento blanco) conditions usually affect the higher elevations.

The Sudestada ("southeasterlies") could be considered similar to the Nor'easter, though snowfall is rarely involved (but is not unprecedented). Both are associated with a deep winter low pressure system. The sudestada usually moderates cold temperatures but brings very heavy rains, rough seas and coastal flooding. It is most common in late autumn and winter along the coasts of central Argentina and in the Río de la Plata estuary.

The southern regions, particularly the far south, experience long periods of daylight from November to February (up to nineteen hours) and extended nights from May to August. All of Argentina uses UTC-3 time zone. The country does observe daylight saving time occasionally.


[edit] History