Rissani sits at the end of the Ziz River valley, where the road runs out and the Sahara begins. Most of its inhabitants still live inside the 18th-century ksar — a maze of narrow, darkened passages that feel genuinely medieval. Five minutes' walk west of town lies the ruined site of Sijilmassa, the first independent Arab and Islamic city in Morocco, founded in the 8th century and powerful through the 14th. Little remains of the structures now, but the setting is atmospheric.
Well worth seeking out is the Kasbah of Oulad Abdelhalim, a magnificent imperial building in better repair than most of the region's ruins. From Rissani you can loop through the surrounding ksour — the circuit starts at Asserehine and winds back past Sijilmassa. The ruined ksar of Tinrheras sits on a hill above the valley and gives a sweeping view over the Tafilalt region. There are a handful of restaurants near the market square, though don't expect much beyond tagine and bread.