Southern Patagonian Ice Field in the area, among which are the Upsala (765 km), Viedma (978 km) and Perito Moreno (258 km) in the Los Glaciares National Park in Argentina, and the Pío XI Glacier or Bruggen Glacier (1,265 km, the largest in area and longest in the southern hemisphere outside of Antarctica), O'Higgins (820 km), Grey (270 km) and Tyndall (331 km) in Chile. The glaciers going to the west flow into the fjords of the Patagonian channels of the Pacific Ocean; those going to the East flow into the Patagonian lakes Viedma and Argentino, and eventually, through the rivers "de la Leona"
Conquest of the Desert the cities of General Alvear, Veinticinco de Mayo and Nueve de Julio. They killed 300 settlers and drove off 200,000 head of cattle. These events were a catalyst for the government to mount the Conquest of the Desert. The Indians drove the stolen cattle from the incursions ("malones") to Chile through the Rastrillada de los chilenos and traded them for goods. The historian George V. Rauch notes evidence that Chilean authorities knew about the origin of the cattle and consented to the trading in order to strengthen their influence over Patagonian territories. They expected eventually to occupy those lands in