The Ebro river is the longest river entirely within Spain. Starting in the Cantabria Mountains, the river flows almost entirely in an east, southeast direction toward the mediterranean sea. Two thirds of the northern tributaries water volume comes from the southern slopes of the pyrenees mountains, along the boarder with France. The Ebro Delta is one of the largest wetlands in the western Mediterranean. Its host to intensive agricultural use with rice, fruit and vegetable farms alongside numerous beaches, marches and salt pans.