Sudan and South Sudan have started withdrawing troops from along their border, a first step in creating a demilitarised buffer zone.
It is part of an agreement the two countries signed last week to resume oil production.
South Sudan halted exports 14 months ago over a dispute on fees.
Previously, 350,000 barrels of oil per day travelled through Sudan.
But now South Sudan is preparing to restart production by the beginning of next week.
Al Jazeera's Anna Cavell reports from the border town of Jau.