Final answer:
The temperate grassland region covering the northeast of Argentina and most of Uruguay is called the Pampas, characterized by its fertile soils and semi-arid climate, suitable for agriculture and cattle ranching.
Step-by-step explanation:
The Pampas of Argentina and Uruguay
The temperate grassland that covers the northeast of Argentina and most of Uruguay is known as the Pampas. This large agricultural region is well-suited for agriculture due to its adequate precipitation and mild climate.
Unlike the extensive Patagonia temperate grasslands or steppes in the south of Argentina, which have been the target of large afforestation plans, the Pampas provides rich agricultural lands and is home to the largest city in Argentina, Buenos Aires.
The region is characterized by its fertile soils, which along with the climate, make the Pampas highly productive for cattle ranching and crop farming, significantly contributing to the breadbasket of the Southern Cone.
The Pampas boasts a semi-arid climate with a medium growing season and excellent soil quality, supported by its dense vegetation of grasses and fertility enhanced by the natural decomposition process in the soil.