It's not in North America, but this natural region has the second highest frequency of tornadoes in the world in its so-called "tornado hall" or pasillo de los tornados.
It's not in North America, but this natural region has the second highest frequency of tornadoes in the world in its so-called "tornado hall" or pasillo de los tornados. This region is home to most of the large estates called estancias. The province of Entre Ríos in this region, which also includes the state of (*) Rio Grande do Sul, is named for the Paraná and Uruguay rivers. The Gran Chaco and Patagonia bound - for 10 points - what region of fertile grasslands in Brazil and northern Argentina, frequented by gauchos and home to Buenos Aires?
It's not in North America, but this natural region has the second highest frequency of tornadoes in the world in its so-called "tornado hall" or pasillo de los tornados.
Pampas [the tossup says "natural region" so don't accept anything else]