The flag of the Andes was a flag used by Argentine

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 patriot José de San Martín

José de San Martín

José Francisco de San Martín, known simply as Don José de San Martín , was an Argentine general and the prime leader of the southern part of South America's successful struggle for independence from Spain.Born in Yapeyú, Corrientes , he left his mother country at the...

 and his Army of the Andes

Army of the Andes

The Army of the Andes was a military force created by the United Provinces of the Río de la Plata and mustered by general José de San Martín in his campaign to free Chile from the Spanish Empire...

 during their famous Crossing of the Andes

Crossing of the Andes

The Crossing of the Andes was one of the most important feats in the Argentine and Chilean wars of independence, in which a combined army of Argentine soldiers and Chilean exiles invaded Chile leading to Chile's liberation from Spanish rule...

 and their subsequent military campaigns to Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 and Peru

Peru

Peru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean....

. The flag of the Andes was personally designed by San Martín and sewn by ladies from the Cuyo

Cuyo (Argentina)

Cuyo is the name given to the wine-producing, mountainous area of central-west Argentina. Historically it comprised the provinces of San Juan, San Luis and Mendoza. The term New Cuyo is a modern one, which indicates both Cuyo proper and the province of La Rioja...

 region and wives of San Martín's officers. It includes a proto-coat of arms of Argentina

Coat of arms of Argentina

The coat of arms of Argentina was established in its current form in 1944, but has its origins in the seal of the General Constituent Assembly of 1813. It is supposed that it was chosen quickly because of the existence of a decree signed on February 22 sealed with the symbol...

 placed horizontally over a sky-blue and white bicolor background.

Legacy

The same design used in the flag of the Andes is used by the provincial government of Mendoza Province

Mendoza Province

The Province of Mendoza is a province of Argentina, located in the western central part of the country in the Cuyo region. It borders to the north with San Juan, the south with La Pampa and Neuquén, the east with San Luis, and to the west with the republic of Chile; the international limit is...

as their official flag.