Her uncle describes her as pregnant and traumatized but otherwise fine.
Amina Ali Nkeki is the first of the 219 Chibok girls to escape from her captors since their abduction grabbed worldwide attention more than two years ago.
She was found wandering in the forest, uncle Yakubu Nkeki told The Associated Press. He said the 19-year-old - she was 17 when she was abducted - was brought to Chibok Tuesday night for her identity to be verified and to be reunited with her mother. Her father died while she was held captive, he said.
Other Chibok girls may also have been rescued by soldiers hunting down Boko Haram in the remote northeastern Sambisa Forest alst night, said Chibok community leader Pogu Bitrus.
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He said he is working with officials to establish their identities.
Boko Haram Islamic extremists stormed and firebombed the Government Girls Secondary School at Chibok on April 14, 2014, and seized 276 girls who were preparing to write science exams. Dozens escaped in the first hours, but 219 remained missing.
The inability of Nigeria's government and military to rescue them led, in part, to the electoral defeat of President Goodluck Jonathan last year.
Nigeria's military has reported freeing thousands this year as they have forced the extremists from towns and into strongholds in the sprawling Sambisa Forest. Boko Haram has turned to soft targets using suicide bombers.