Laguna del Desierto incident Laguna del Desierto region, the tribunal set the "hito 62" (cornerstone 62) at the O'Higgins/San Martin Lake and draw the boundary from there to mount Fitz Roy on the Martínez de Rozas Range awarding Chile the complete valley of Laguna del Desierto. In 1946 an aerial reconnaissance of the United States Air Force, ordered by the Chilean government, revealed that the lake emptied to the Atlantic shores. Chile and Argentina have to redraw its maps. The initially organized labour support for 1963 elected Argentine President Arturo Illia turned to antagonism during 1964, as secret plans for Juan Domingo Perón's return
Laguna del Negro Francisco Laguna del Negro Francisco lies northeast of the city of Copiapó in the Atacama Region of Chile, and can be reached by south-bound roads that diverge from the Copiapó-Tinogasta road close to the Salar de Maricunga. A National Forest Corporation building is close to the southwestern shore of the lake. The area has been called a "scenic beauty". The lake lies at an elevation of , is wide and has a surface area of , but a depth of only about ; the Ministry of Public Works estimated a mean depth of in 1941. The water surface can fluctuate between