The vegetation recovery is stronger towards the north and culminates around the Senegal River. The northern drylands are dominated by pastoralists with limited agriculture. Grasses make up most of the primary production (Diallo et al., 1991). It is likely that the same processes discussed for Mauritania also relate to the Senegal grasslands. The wetter south is dominated by millet and groundnut agriculture, with annual productions being discernable in AVHHR data (Fuller, 1998; Knudby, 2004). Vegetation recovery in the inland of Senegal closely follows the rainfall increase. The rainfall along the coast is more maritime, and hence both the estimate is more uncertain, and the timing of those maritime rains can also be less biologically available. The anomalous stronger vegetation recovery along the Senegal River in both Mauritania and Senegal can indicate changes in managerial regimes, including irrigation. From analysis of 1.1 km AVHRR data Fuller (1998) found increases in NDVI related to irrigation expansion in the Senegal River Valley. Click here for RUE trend map.