The Chaco War (1932–1935) (Spanish:Guerra del Chaco) was fought between Bolivia and Paraguay over control of the northern part of the Gran Chaco region (known as Chaco Boreal) of South America, which was thought to be rich in oil. It is also referred to as La Guerra de la Sed (Spanish for "The War of the Thirst") in literary circles for being fought in the semi-arid Chaco. The war was the bloodiest military conflict fought in South America during the 20th century.
La frontera entre Paraguay y Brazil por el lado de Pedro Juan Caballero (frente del Shopping China). The border between Paraguay and Brazil on the side of Pedro Juan Caballero (in front of Shopping China). Photographed by David Brunner Halliday.