How many nations are there in plains?

The term "plains" generally refers to large, flat areas of land and does not denote a specific political or geographical entity. Therefore, there isn't a definitive number of nations associated with plains. However, many countries contain plains, including the United States (Great Plains), Argentina (Pampas), and India (Gangetic Plain), among others. The exact number of nations with plains can vary depending on the definitions and criteria used.