This video is in 4K UHD. I recommend you watch it full-screen. [Note: the Safari browser will only play video in HD, so if you have a 4K screen I recommend Firefox or another browser.]
The Dolores River originates high in the San Juan Mountains. It flows south until it reaches the town of Dolores, Colorado. There it pauses for a while in McPhee Reservoir. It then turns northerly until it ultimately joins the Colorado River above Arches National Park.
Dolores Canyon is considered that stretch of the Dolores River downstream of the reservoir. Initially the canyon is wide and tame. But as you go farther the walls close in. The section featured in this video is accessed via county roads east of the town of Dove Creek. When there is enough flow, this stretch is popular with rafters.
The first two "scenes" were photographed from the Dolores Canyon Overlook on the rim. The rest were from the canyon floor.
The gravel road from the top continues past a day-use, river access to a secluded BLM campground. Downstream from there a high-clearance vehicle is recommended. There are a number of sites for dispersed camping along the river road.
You can find more information in my blog:
Video was taken using a DJI Mavic 2 Pro on June 3 and 4, 2019.