Arroyo Conejo Open Space, open space reserve in Newbury Park, California, United States

Arroyo Conejo Open Space is a nature preserve in Newbury Park with deep canyons, year-round streams, and California oak woodlands growing along steep cliffs. The site features a network of trails with several creek crossings connected by wooden pallet bridges.

The preserve was established in 1977 to protect the natural resources and archaeological sites of Conejo Valley. This conservation effort secured the area's future and prevented development that would have changed its landscape.

Locals call the gorge La Branca or the Barranca, Spanish for "the canyon"; it is also nicknamed the Grand Canyon of the Conejo Valley. The name covers a ravine running three miles from near the Rancho Conejo Playfields to Hill Canyon. The Conejo Valley Audubon Society met The Nature Conservancy here in 1974, and one visitor described finding a primordial setting within the city limits of a Los Angeles bedroom community.

The main parking area is at Rancho Conejo Playfield, where trails begin leading into the preserve. Be prepared for uneven terrain, water crossings, and elevation changes along the paths.

The constructed wetlands at Hill Canyon, within about 15 acres of the preserve, were planted with 1,600 native trees, 7,000 emergent marsh plants, 6,000 low herbaceous wetland plants and 1,200 riparian scrub plants after invasive species were removed. They now shelter the southwestern pond turtle alongside mallards, coots and herons.