S Sudan: Rebels grant BBC rare access to stronghold
23 January 2014 Last updated at 07:04 GMT
South Sudan's government and rebels are to sign a ceasefire shortly, mediators in Ethiopia say.
In the past week, troops loyal to the government in South Sudan recaptured all of the major towns that were controlled by the rebels.
The BBC's Mark Lowen is the first journalist to enter Lankien, a rebel stronghold in the north east of the country.