The March 7 kidnapping was the first mass abduction in Africa's most populous nation since 2021.
It comes after Gambia imposed fines and jail sentences for those who carry out female circumcision.
"I realised I was up to my waist down a hippo's throat."
The boat was carrying around 86 people including women and children.
African elephants dying of Bacterim, likely due to drought, heat, population
There are 10,000 people still missing.
Hospitals in the eastern city of Bayda were evacuated after severe flooding
The number of people injured stands at 43.
Military officers in Gabon said they had seized power, placing President Ali Bongo under house arrest.