Input (grade 10): The Santa Margarita River is a short intermittent river on the Pacific coast of southern California in the United States, approximately 30.9 m long. One of the last free-flowing rivers in southern California, it drains an arid region of the Coast Ranges between Los Angeles and San Diego at the southern end of the Santa Ana Mountains.
Output (grade 12): The Santa Margarita River is a river in southern California, between Los Angeles and San Diego.