Crestline is a census-designated place in the San Bernardino Mountains of San Bernardino County, California. The population was 10,770 at the 2010 census, up from 10,218 at the 2000 census.

Located in the community of Crestline, Lake Gregory Regional Park is a hidden gem tucked in the cool cedar and pine forest of the San Bernardino Mountains. The lake has 84 surface acres for swimming and water sports and is a cool respite in the hot summer months in the city.

San Bernardino County is a county located in the southern part of the state of California, United States. It is the largest county in the contiguous United States by area, covering approximately 20,105 square miles, and has a population of around 2.1 million people. The county is situated east of Los Angeles County and is part of the Greater Los Angeles area.

Silverwood Lake is a large reservoir in San Bernardino County, California. It was created in 1971 as part of the State Water Project by the construction of the Cedar Springs Dam as a forebay on the 444 mi (715 km) long California Aqueduct, and has a capacity of 73,000 acreâ‹…ft (90,000,000 m3).

San Gorgonio Mountain is the highest peak in Southern California and the Transverse Ranges at 11,503 feet (3,506 m). It lies within the San Gorgonio Wilderness, part of the Sand to Snow National Monument.

Lake Arrowhead is a mountain resort town located in the San Bernardino Mountains of Southern California. It is situated in the heart of the San Bernardino National Forest and is known for its natural beauty, outdoor recreation opportunities, and historic charm.

The Providence Mountains State Recreation Area is located in the Providence Mountains, within the Mojave National Preserve in San Bernardino County, California. It is also home to the Mitchell Caverns Natural Preserve which are natural wonders and the only limestone caves in the state park system.