Tan-Tan (Arabic: طانطان) is a city in Tan-Tan Province in the region of Guelmim-Es Semara in south-western Morocco. It is a desert town with a population (2004 census) of 60,560, the largest in the province and second largest in the region behind the capital Guelmim. The Draa River, at 1,100km the longest in Morocco, flows into the Atlantic Ocean after Tan-Tan. The town also has an airport, Tan Tan Airport.