Fences have been erected to prevent the advance of sand dunes at Gour. - - Fight against desertifiction of agricultural land in Niger: NER/89/004. Various ways are used to stop the desert from advancing. Fences are mainly built with the local bush (leptadenia pyrothecnica) or with dead palm leaves. When sand dunes have been fenced, grass is grown on them. The project assisted by the UN/Food and Agri