Police have charged a woman with 12 counts of having sex with a boy under 16-years old.

NT Police media manager Rob Cross said the 22-year-old woman was scheduled to appear in Alice Springs Local Court on Tuesday.

He said police allege the woman travelled from an un-named place interstate to Alice Springs, and had sex with the boy during October to early November.

Mr Cross did not say how old the boy was. He did said the woman was arrested by detectives from the Southern Serious Crime division and charged with 12 counts of sexual intercourse with a child under the age of 16.

Police did not say when she was arrested.

There were not further details provided.