Which Sufi brotherhoods have many followers in Mauritania?

In Mauritania, the two major Sufi brotherhoods that have numerous adherents throughout the country are the Qādiriyyah and the Tijāniyyah orders.1

These mystical brotherhoods, or tariqas, are deeply integrated into the religious life of the population, though there is no distinct pattern in their geographic distribution across the country. While these groups have many followers, urban religious identity in Mauritania is often more closely tied to rural origins, ethnicity, or local places of worship than to specific brotherhood affiliation.12