The term 'CABALLERO's Locale' can be solved by the crossword solution 'LLANO' (5 letters). A llano is a flat, grassy PLAIN found in the southwestern United States and northern Mexico. It is an area of land that is usually dry and has sparse vegetation. The term is derived from the Spanish word for 'PLAIN' or 'level ground'. Caballeros are Spanish knights, so it is likely that the locale in question is a flat, grassy PLAIN in a Spanish-speaking region.