Guemar is a Saharan oasis town in Algeria near the Tunisian border, in the Oued Souf area of the El Oued Province, about 20 km north of El Oued. It includes a zaouia and a border post. According to the 2008 census it has a population of 39,168, up from 29,185 in 1998, with an annual growth rate of 3.0%.