I want to add something what Desertrunner already write. Yes, it is possible to drive from Mali to Morocco thru Mauritania. I exit Mali by the city Nioro du Sahel (I didn’t done any border formalities, may be I should) and entered Mauritania by city Ayoun el’ Altros, where we do all border formalities, like insurance for the car and temporally importation for the car – they just write down in the passport. Chief of “border stop” is nice guy, first was very strict and serious and after when we eat together he show us the real face. Say hallo to him from two Slovenian guys in blue 2 cv - Diane.
Visa for Mauritania in Bamako was no problem. Problem was visa for Morocco in Nouakchott. They say that because we are Slovenians we are not in theirs direction, so we can’t get the visa! And we did not have it! They say it is only for Moroccan in Mauritania. Try to get it in Bamako! Maybe is for France citizens different, don’t now. We have little problem to come in Morocco without valid visa. We have old one, three months old and on border post Al Gargarat they didn’t saw, that we don’t have double entrance on our visa. They find it later, near Al ‘Ayoun, but we talk it out without bribery.
For next time I know.
Save travels and a lot of adventure