A TEENAGE girl mysteriously disappeared after traveling to San Diego to “sleep on the beach”, reports say.

Authorities are searching for Serena Stevens, 19, after she was reported missing by her sister on January 17.

San Diego cops say that she arrived on the West Coast on January 12 and reportedly told her sibling that she was heading to the beach to sleep.

It’s believed that Serena traveled to the city from New York on the same day.

Family members said they spoke to the 19-year-old the following day, according to NBC7.

Officers say that Serena has shared images and videos of the Ocean Beach coastline on her social media accounts.

Ocean Beach is located around seven miles from downtown San Diego.

Family members have issued pleas online as they try to pinpoint Serena's whereabouts.

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A woman, who is believed to be Serena’s twin, said the 19-year-old went to San Diego with a “bag of some clothes and a tent”.

In a Facebook post, Serena’s grandma said the teen “promised to be in contact with her twin”, adding that she had not heard from her for three days.

Police say that the 19-year-old is considered "at risk" as she’s never been reported missing before, according to the outlet KUSI.

Family members have also shared photographs of the Ocean Beach coastline as try to find clues.

Dozens of social media users are praying for Serena to be found safe.

The teen is around 5 feet 5 inches tall, has brown hair, and weighs around 140 pounds, according to cops.

Anyone with information is urged to contact the San Diego Police Department at (619) 531-2000, using ID number #22-500059.

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