Mauritania passport holder, Mauritania citizen require a valid visa for Vietnam: Tourist visa or business visa.
There are 2 options to get Vietnam visa
Visa at embassy / consulate of Vietnam in their city.
Visa on arrival at airport in Vietnam.
Should you need further assistance or need more information for Vietnam visa, please feel free to get in touch with us by email at: firstname.lastname@example.org or Mobile +84904479239, Whatapps https://wa.me/+84904479239 . We are always at your service. Welcome and have a nice journey to Vietnam!.