It is bordered by Anaheim on the south , Placentia on the west and southwest , Brea on the northwest , Chino Hills State Park on the north , and Corona on the east .
It is bordered by Anaheim on the south , Placentia on the west and southwest , Brea on the northwest , Chino Hills State Park on the north , and Corona on the east and bordered by the counties of San Bernardino and Riverside .