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.
Read more about Emirate Of Trarza: Early History, Society and Structure, Interactions With The South and Europeans: 18th Century, Trade and War: Early 19th Century, Second Franco-Trarza War, "Pacification":1900-1905, Resistance and Occupation: 1905-1934