Answer: Your answer is Caballos and Gauchos.
Explanation: Gauchos are cowboys that are the most famous and commonly found in the pampas region of Argentina. Horses are ridden by the cowboys so they are pretty common too, and with it being a flat land theres miles of land for them to run. It would not be mountains due to it being a flat land, and it would not be grilled meat because that would be mainly related to the culture of a community in Argentina.