Zenaga (autonym Tuḍḍungiyya) is a Berber language spoken between Mederdra and the Atlantic coast in southwestern Mauritania and in Senegal. It shares its basic linguistic structure with other Berber idioms, but specific features are quite different. In fact, Zenaga is probably the most divergent surviving Berber language, with a significantly different sound system made even more distant by sound changes such as /l/ > /dj/ and /x/ > /k/, as well as a difficult-to-explain profusion of glottal stops. Adrian Room's African Placenames gives Zenaga derivations for some place-names in Mauritania.