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Use "southwestern" in a sentence
"When in southwestern Iowa and the emergency broadcast network breaks over the radio with a tornado warning ... and you pull off the highway to hide under an overpass ... it's not a cool parenting move to suggest to the 8-year old in the back seat that he look out the window and see if he can spot a funnel cloud."
"As soon as my savings permitted, I relocated to the west coast, to southern California, and later purchased a small piece of property in southwestern Colorado."
"For me, Cinderella number one has to be the Animas River in southwestern Colorado."