Its drainage basin is 270,000 square kilometres (100,000 sq mi) in area, and its mean discharge is 200 cubic metres per second (7,100 cu ft/s).

[4] The Pilcomayo rises in the foothills of the Andes mountain range in the Oruro Department in Bolivia, east of Lake Poopó.

[5] Upstream the Jach'a Juqhu River successively receives the names Aguas Calientes and Kachi Mayu.

[6][7] From there, it flows in a southeasterly direction through Chuquisaca and Tarija departments, passes through the Argentine province of Formosa and the Gran Chaco plains of Paraguay, forming most of the border between these two countries before it joins the Paraguay River near Asunción.

[8] Men of this tribe are generally tall and skinny, built like hunters or warriors, whereas women are short in size.