Gran Chaco Lowland plain of central South America, stretching across the borders of Argentina, Bolivia, and Paraguay. Arid and largely unpopulated, the region is famous for its quebracho trees, a major source of tannin. The discovery of oil in the Chaco Borea, and Bolivia's subsequent need for a route to the sea, led to the Chaco War (1932–35) between Bolivia and Paraguay. The war killed more than 100,000 soldiers before an agreement gave 75% of Gran Chaco to Paraguay, and allowed Bolivia use of the Paraguay River.
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