Question: In which region is the lake, found in Patagonia and shared by Argentina and Chile, located?

Documents:
source: General Carrera Lake
text: General Carrera Lake General Carrera Lake (Chilean side, officially renamed in 1959) or Lake Buenos Aires (Argentine side) is a lake located in Patagonia and shared by Argentina and Chile. Both names are internationally accepted.

source: Meseta Cosmelli Airport
text: Meseta Cosmelli Airport Meseta Cosmelli Airport (Spanish: "Aeropuerto Meseta Cosmelli" ), (ICAO: SCMC) is an airstrip 18 km northeast of Puerto Guadal , a small town on the southwestern shore of General Carrera Lake in the Aysén Region of Chile.

source: Argentina–Chile relations
text: Argentina–Chile relations Argentina–Chile relations refers to interstate relations between the Republic of Chile and the Argentine Republic. Argentina and Chile share the world's third-longest international border, which is 5300 km long and runs from north to the south along the Andes mountains. Although gaining their independence during the South American wars of liberation, during much of the 19th and the 20th century relations between the countries were chilled as a result of disputes over the border in Patagonia. In recent years relations have improved dramatically. Despite increased trade between the two countries, Argentina and Chile have followed quite different economic policies. Chile has signed free trade agreements with countries such as China, the USA, Canada, South Korea and the EU and is an active member of the APEC, while Argentina belongs to the Mercosur regional free trade area. Both countries are members of the Union of South American Nations.

source: Patagonia
text: Patagonia Patagonia (] ) is a sparsely populated region located at the southern end of South America, shared by Argentina and Chile. The region comprises the southern section of the Andes mountains as well as the deserts, pampas and grasslands east of this southern portion of the Andes. Patagonia has two coasts: western facing the Pacific Ocean and eastern facing the Atlantic Ocean.

source: Patagonia Sin Represas
text: Patagonia Sin Represas The phrase Patagonia Sin Represas means “Patagonia without dams.” It's the slogan of people and groups who oppose the proposed hydroelectric dam project of HidroAysén in the Aisén Region of Chile. Posters and bumper stickers with the slogan are a common sights as a majority of Chileans and residents of the region in particular, oppose the project. The Aisén region is the XI region in Chile, home to Chile’s portion of Patagonia, the least populated region. The terrain is characterized by coastal mountains, rolling hills, fjord land, and large glaciers. The annual rainfall in certain parts of the region can exceed 300 inches. The region is home to Patagonian Southern Ice Sheet, the third largest ice sheet behind Greenland, and Antarctica.

source: Valdivia Province
text: Valdivia Province Valdivia Province (Spanish: "Provincia de Valdivia" ; ] ) is one of two provinces of the southern Chilean region of Los Ríos (XIV). The provincial capital is Valdivia. Located in the province are two important rivers, the Calle-Calle / Valdivia River and the Cruces River. It is part of Northern Patagonia and its wild virgin forest embrace the Patagonian Cordillera following the river Calle Calle down to the Pacific Ocean. It is known in Patagonia the term "Bosque Valdiviano" referring to the primitive forest of Valdivia with its native trees. These forests are present in some parts of Northern Patagonia, both in Chile and Argentina.

source: Patagonia Rebelde
text: Patagonia Rebelde Patagonia Rebelde (or Patagonia Trágica) ("Rebel Patagonia" or "Tragic Patagonia" in English) was the name given to the violent suppression of a rural worker's strike in the Argentine province of Santa Cruz in Patagonia between 1920 and 1922. The uprising was put down by colonel Héctor Benigno Varela's 10th Cavalry Regiment of the Argentine Army under the orders of President Hipólito Yrigoyen. Approximately 1,500 rural workers were shot and killed by the Argentine Army in the course of the operations, many of them executed by firing squads after surrendering. Most of the executed were Spanish and Chilean workers who had sought refuge in Argentina's Patagonia after their strike in the city of Puerto Natales in southern Chile on 27 July 1920 was crushed by the Chilean authorities, at the cost of four carabineers killed. At least two Argentine soldiers (corporal Domingo Montenegro and private Fernando Pablo Fischer), three local policemen (sergeant Tomás Rosa and constables Ernesto Bozán and Juan Campos) and a number of ranch owners and their relatives also died during the strife.

source: Christopher B. Anderson
text: Christopher B. Anderson Dr. Christopher B. Anderson (born 31 December 1976 in North Carolina) is an American ecologist working in southern Patagonia's Tierra del Fuego Archipelago, shared between Chile and Argentina. Anderson obtained his B.S. in Biology with Honors from the University of North Carolina at Chapel Hill in 1999 and his Ph.D. in Ecology from the Odum School of Ecology - University of Georgia in 2006. His research in southern Patagonia has involved social entrepreneurial efforts, as well, such as the creation of the Omora Sub-Antarctic Research Alliance (USA), a non-profit dedicated to promoting research, education and conservation in Tierra del Fuego and southern Patagonia. Anderson and his colleagues also have developed long-term socio-ecological research platforms that attempt to link long-term academic endeavors with society to demonstrate the inextricable union between conservation and social well being. In 2005, this initiative was able to successfully apply to UNESCO to obtain the designation of the Cape Horn Biosphere Reserve.

source: Vintter Lake
text: Vintter Lake Vintter Lake or Palena Lake is a lake located in Patagonia which is shared by Argentina, where it is known as Lago General Vintter, and by Chile, where it's called Lago Palena. Both names are internationally accepted. The Argentine name is after General Lorenzo Vintter, the second governor of the Argentine Territory of Patagonia (1882–1884), and the first governor of the Territory of the Río Negro (1884–1888).

source: Patagonian Desert
text: Patagonian Desert The Patagonian Desert, also known as the Patagonia Desert, Patagonian Steppe, or Magellanic Steppe, is the largest desert in Argentina and is the 8th largest desert in the world by area, occupying 673,000 square kilometers (260,000 mi). It is located primarily in Argentina with small parts in Chile and is bounded by the Andes, to its west, and the Atlantic Ocean to its east, in the region of Patagonia, southern Argentina. To the north the desert grades into the Cuyo Region and the Pampas. The central parts of the steppe are dominated by shrubby and herbaceous plant species albeit to the west, where precipitation is higher, bushes are replaced by grasses. Topographically the deserts consist of alternating tablelands and massifs dissected by river valleys and canyons. The more western parts of the steppe host lakes of glacial origin and grades into barren mountains or cold temperate forests along valleys.

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Answer: Aysén Region