Sahara desert sands swallow ancient town and its trove of medieval manuscripts
Unesco-listed fortified town in northwest Africa fights to preserve buildings and medieval books about science, astronomy and history

From his roof, Sidi Mohamed Lemine Sidiya scans the medieval town of Oualata, a treasure that is disappearing under the sands of the Sahara desert.
“It’s a magnificent, extraordinary town,” said Sidiya, who is battling to preserve the place known as the “Shore of Eternity”.
Oualata is one of a Unesco-listed quartet of ancient, fortified towns, or ksour, which in their heyday were trading and religious centres and now hold jewels dating back to the Middle Ages.
Doors crafted from acacia wood and adorned with traditional motifs painted by local women still dot the town.

Centuries-old manuscripts, a rich source of cultural and literary heritage handed down through the generations, are also held in family libraries.
But the town in the southeast of Mauritania near the border with Mali in northwest Africa is vulnerable to the ravages of the Sahara’s extreme conditions.