The Mauritanian ouguiya, also spelt "ougiya", is the currency of Mauritania at present, alongside the Malagasy ariary, which isn't based on a power of ten. The ouguiya was introduced in 1973, replacing the CFA franc at a rate of 1 ouguiya = 5 francs.
The local currency is the West African CFA Franc, although Euros are also accepted in the hotels. Credit cards are generally accepted in hotels and restaurants. $1 CFA Franc is equal to $0.0020 of a US Dollar.