Errachidia, formerly known as Ksar es-Souk, has a rich and layered history that reflects its role as a crossroads of ancient trade routes and cultures in southeastern Morocco. Established in the early 20th century during the French colonial period, the city was initially developed as a strategic military post and administrative center in the Tafilalt region. However, its roots go much deeper, with the surrounding areas historically inhabited by Berber tribes and later influenced by Arab expansion.

Historically, Errachidia’s location near the fertile Ziz Valley made it a vital point for caravans traveling between North Africa and sub-Saharan Africa. Traders from Timbuktu, Marrakech, and Fez passed through here, exchanging goods like salt, gold, and dates, making Errachidia an essential link in trans-Saharan commerce. The city also served as a base for the Alaouite dynasty, Morocco’s current ruling family, who have ancestral ties to the region, particularly the ancient city of Sijilmasa nearby, which was a flourishing trade hub and one of the earliest settlements in the Tafilalt oasis.

Today, Errachidia preserves its historical heritage while offering a gateway to Morocco’s vast desert landscapes. Visitors can explore remnants of ancient ksars (fortified villages), experience traditional Berber culture, and learn about the region’s strategic importance in Morocco's past. The combination of natural beauty and historical significance makes Errachidia a fascinating stop for those interested in exploring the cultural and historical richness of Morocco’s Sahara regions.