This largest undeveloped expanse of habitat in western Riverside Co. features a large reservoir (Lake Mathews) surrounded by annual grassland and arid, Riversidean Coastal Sage Scrub that extends over hilly terrain about 10 miles south to Interstate 15. Much of the land has been designated the Estelle Mountain Lake Mathews Reserve.

Montecito Ranch Park is a public park located in Corona, a city in Riverside County, California, United States. The park features 22 acres of rolling hills and offers various recreational amenities, including hiking trails, picnic areas, a playground, and sports fields.

Corona is a city located in Riverside County, California, United States. It is located approximately 45 miles southeast of Los Angeles and 95 miles north of San Diego. As of the 2020 census, the population of Corona was 170,616, making it one of the largest cities in the Inland Empire region of Southern California.

Tin Mine Canyon is a hiking trail located in Corona, a city in Riverside County, California, United States. The trail is situated in the foothills of the Santa Ana Mountains and offers scenic views of the surrounding hills and canyons. The trail is approximately 2.5 miles long and is considered moderately difficult, with steep inclines and uneven terrain.

Skyline Drive Trail is a hiking trail located in Corona, a city in Riverside County, California, United States. The trail is situated in the Santa Ana Mountains and offers scenic views of the surrounding hills and valleys. The trail is approximately 5 miles long and is considered moderately difficult, with steep inclines and rugged terrain.