The Southwestern Plains is a region of the United States that encompasses parts of Texas, Oklahoma, New Mexico, and Colorado. It is characterized by its flat terrain and dry climate. Two words that are associated with this region are Llanos (6 letters) and Adobe Flats (10 letters). Llanos is a Spanish word that refers to the vast grasslands of the Southwestern Plains. Adobe Flats is a term used to describe the flat, arid land of the region, which is often covered in adobe soil.