sentences:  These include most of San Juan Creek, upper Arroyo Trabuco, Cañada Gobernadora, Bell Canyon, and other headwater streams, as well as scattered patches along Oso and El Horno creeks.Forests are present at high elevations, and also occur in close proximity to waterways.Coastal sage scrub is found on south-facing hillsides, while chaparral is found on higher-elevation hillsides and mesas.