Southwestern GULLY, also known as an ARROYO, is a dry creek bed or gulch that is found in the southwestern United States. It is typically formed by seasonal flash floods and can be seen in areas with low rainfall and sparse vegetation. The term is derived from the Spanish word for 'GULLY' or 'RAVINE'. Southwestern Gullies are often used as a source of water for livestock and wildlife, and can provide a habitat for a variety of species.