An arroyo is a small, steep-sided watercourse or creek that typically forms in arid or semi-arid regions. These channels often carry water only during periods of heavy rain or snowmelt, making them intermittent streams. Arroyo formations are common in areas like the southwestern United States and parts of Mexico. The term "arroyo" is derived from the Spanish word for "brook" or "stream." These features play a crucial role in the local ecosystem, providing habitats for various plants and animals. They can also influence soil erosion and sediment transport in their surrounding landscapes.