zug (also transliterated "zoug", "sug"; arabic: زوك) is located in the far south-east of western sahara, 170 km. from atar, mauritania. the only "erg" or "sand sea" in western sahara (known as "galb azefal") is located nearby, where it runs from south-west to north-east from mauritania into western sahara and back into mauritania, where the border forms a right angle. zug is located in the part of western sahara controlled by the polisario front and often referred to as the "liberated territories". it is the head of the 1st military region of the sahrawi arab democratic republic and holds a spla military outpost and a small hospital.