1

I entered Burkina before my visa became valid, no problem. I don't know how vigilant Mauri border staff are.

Dave

2

Mauritanian immigration officials being corrupt as one can be you might have to pay a bribe even with a valid visa.... :)

I think that's the worst that might happen to you, having to pay a bribe, but i'm pretty sure they won't even notice the date. go for it, be confident, don't ask anything, it'll work they won't notice.

3

I arrived today in Mauritania by Air. The immigration officers stopped me at the counter and made me stay. Actually, they stopped anyone not having an african passport. Altogether, they stopped 2 americans, 1 french, 1 american with diplomatic passport, pakistan (me) and a british. Nobody of us paid and were let go after asking where are we going, where we are staying, how did we got the visa, the purpose and the general questions.

I usually avoid paying any kinds of bribes at the airport because these countries are less travelled airports and these people usually remember you and ask you for money when you are leaving the country. Its better to keep haggling (politely) with them and answering them and asking them if you can go.

If you received the visa with the help of an invitation of a local mauritanian company or person, it is better that you keep a copy of the invitation or if that person is present in person to receive you. That was the reason all of us were stopped. I was eventually let go when I showed them a soft copy of my invitation. Others made a call to their contacts or had someone waiting for them.

People are polite and cannot ask directly for bribes.

I am currently in Noaukchott until friday and would be glad to answer any questions you may have.

Good luck with your travelling.