The valley that runs through the heart of Riyadh, a 120-kilometre stretch of green corridor restored from a polluted drainage channel into a park with walking and cycling paths, palm groves, small lakes, and restored wetland vegetation. On weekday mornings it is used by joggers and families; on weekends it fills with picnickers and children. It is also one of the better birdwatching spots in Riyadh, with waders, kingfishers, and migrating raptors using the wetland areas.
The path from the old city area through to Diriyah can be walked or cycled in a day. Several cafes and rest areas are distributed along the route. The best section for scenery is the stretch through Diriyah, where the wadi runs below the mud-brick walls of the old capital. Entry is free; accessible at all hours.