High Quality Content by WIKIPEDIA articles! The Emirate of Trarza was a precolonial state in what is today southwest Mauritania, which has survived as a traditional confederation of semi-nomadic peoples to the present day. Its name is shared with the modern Region of Trarza. The population, a mixture of Berber tribes, were later conquered by Hassaniya Arabic speakers from the north. Europeans called these people Moors/Maures, and thus have titled this group the Trarza Moors.