You have to present some required documents for obtaining a visa on arrival. Beyond these border control may require additional documents that prove your eligibility to enter Mauritania.
All nationals from all the countries except Syria are eligible to Mauritania Visa on Arrival.
Yes, you can obtain visa on arrival to Mauritania at both airport and land borders.
You must meet certain requirements to enter Mauritania, even if you are not required a visa:
Mauritania visas can be: