A speed limit sign is seen in the outskirts of Ain Safra in the high steppe region of south western Algeria January 25, 2017. For the first time in years, the orange Saharan Atlas dunes near Ain Sefra in the west have been covered by a layer of frozen white."It's been a long time since we experienced such a snowfall," says local resident. Picture taken January 25, 2017. REUTERS/Zohra Bensemra