The Mauritanian Basin and Coast The Beydani tribes We must add to the Idilieh of the Nakeb origin the people of Nabou, the people of Amilha, and the people of Baba, who came from the northeast in ancient times. The southern Idilieh migrate between Sombé and Garto and descend to Farimake (Niakoumaké) and Bassikounou. They have been administratively subordinate to the circle of Koundam since 1913, and they have retained the use of the well of El-Arneb, which is considered their primary water source despite its depth (75m) and relative salinity. It is one of the most important wells in the region. It has always remained their center, and today men from the Zmagna tribe cooperate with them in its maintenance (3). As for the northern Idilieh, they migrate around El-Arneb, El-Hassi El-Tawil, and Bouzerbiba, at the latitude of Ras El-Ma, and towards Garko and Boudoubadi (circle of Issa-Ber), and to Genka and El-Qasi (Koundam). They only rarely descend below the pools of Talfakia, Karkarat, and Karnati. In winter, they sometimes stay in this area or head towards the north of Avakibine. The resources of the well of Sheikh Ahmed, north of El-Hassi El-Tawil, which is now ruined, were a special financial resource for them. About a hundred people from the Aqallat, Awlad Allouch, Tarakaz, and El-Wosra live among them. And the people of Berberdou, Agad, Iflan, and a camp of the people of Abd El-Moumen, which makes this branch somewhat heterogeneous; (3) a Tuareg clan. The Idilieh have been cultivating their share of the floodplains in Avakibine and Daouna for a very long time. The southern group exploits the banks of Lake Kabbara, while the northern group has its farms in Avakibine itself. Every year, they reside there with their men and servants in a fertile area designated for agriculture called Dilibadi. They cultivate millet there, along with some wheat fields. In 1898, they paid us a tax of 1600 kg of millet for these crops, in 1899: 5580 kg, and in 1900: 1708 kg. However, the drought of the lake has significantly reduced these cultivations. 64