Every year, in the Malian town of Diafarabé, Fulani men cross the Niger River with their cattle, in an annual cycle of transhumance. This annual festival is known in the local Fulfulde as the "Dewgal". Since the founding of the village in 1818, it has always been the most important Fulani festival. It takes place on a Saturday in November or December; the day is carefully chosen based on the state of pastures and the water levels in the river Niger. During the rainy season, the river swells, and the areas around the village are inundated in water, as the level of the river Niger rises, and turns Diafarabe into an island. The cattle are kept on the lush fields up north or south, but when the West African Monsoon subsides and the drier season returns, the water level drops and the cattle can return home again.