A 5-year-old girl who disappeared from a family outing in San Mateo County was found nearly four hours after a massive search party scoured the hills west of Woodside.

The family was part of a large overnight camping trip at Huddart County Park, which covers around 900 acres of woodland, ravines and dense forest.

According to the San Mateo County Sheriff's Office, the girl was playing with friends at about 7:15 p.m. when she ran away from the area. Her parents were unable to find her and the child's mother called 911.

More than 75 officers and volunteers from the sheriff's office, the county parks department, the California Highway Patrol, and a search and rescue K-9 team joined the search effort.

The girl, who had been wearing a glow stick necklace and carrying a flashlight, was spotted by a CHP helicopter at about 11:30 p.m., according to the sheriff's office.

She had apparently become disoriented and wandered into a steep gorge.

The girl was not injured, but was taken to a hospital to be monitored for exposure.