Paramjit,
I think you are actually refering to the tarmac road between Nouakchott & Atar. There is no road between Nouadhibou & Atar - rather it is a sandy track that follows the railway line.
Shane,
There are a couple of villages along the railway line, including some workers huts where you would most likely to be able to get water. You can definitely get water in Choum, assuming you go via Choum, rather than heading inland direct to Atar.
If you are riding on the piste, rather than the railway line, you will find that the sand is soft in places, so I think your estimate of up to 80kms per day is possibly a little optimistic.
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