Chad, Niger, Central African Republic, Mali and Somalia have been ranked at the top of an index of countries listing the hardest place to be a girl.
The report, called Every Last Girl, ranks countries based on schooling, child marriage, teen pregnancy, maternal deaths and the number of women in parliament.
The study by Save the Children says girls in Somalia as young as 10-years-old are forced to marry men much older than them.
The report says girls also suffer during humanitarian crises such as the Ebola outbreak in Sierra Leone where the shutting down of schools led to an estimated 14,000 teen pregnancies.