Map of Mauritania

If you can see Nouakchot capital on the coast, 'The Road of Hope' that goes east to Boutelimit. The mahdhara of Shaykh Bah, Nabbaghiya, is a bit before that town. Much further down that road, you have the town of Kiffa, where the mahdhara of Shaykh Salik from Zaytuna Institute California. From Kiffa, you are only 60 or 80 km from Murabit al Hajj. I would tell you were it was if I knew! It is not far, but inside the region of Tagant.

And from Nouakchot on the road that goes south to Senegal, after maybe 100 km, you have the mahdhara of Muhammad Hassan al Khadim, the grandson of Muhammad Mawlud, who wrote 'Purification of the heart' that Hamza Yusuf has translated. Muhammad Hassan al Khadim has also written an excellent sharh of that book, as well as most book of Muhammad Mawlud, all available in print, from UAE.
I had the chance to sit and study with that honourable shaykh who is the humblest shaykh I have ever seen. You would have to go to understand; words could not describe his station.