What geographic feature is commonly associated with Oklahoma?

Oklahoma is primarily characterized by its vast plains and prairies, which are integral components of its geography and climate. The state's landscape is dominated by rolling hills, grasslands, and open spaces, particularly in the western and central regions. The presence of these plains and prairies has historically influenced agriculture, ranching, and the way of life for many Oklahomans. They provide fertile land for farming and grazing, which has played a crucial role in the state's economy and cultural identity.

In contrast, the other geographic features listed are not associated with Oklahoma. The Rocky Mountains lie to the west, primarily in Colorado and further north. The Great Lakes are located far to the north and east, while the Appalachian Mountains are found on the eastern side of the United States, well outside Oklahoma's borders. Therefore, the plains and prairies stand out as the defining geographic feature of the state.