Still others join caravans to engage in trade activities. The largest Saharan caravanners, the Touareg Kel Ewey (and the Kel Gres) of Niger, are farmer-pastoralists with concessions and gardens in Air or millet fields in Ader. Some cross the Tenere desert to trade their farm products for salt and dates (e.g., Fachi, Bilma and Djado).