Aragon has a population, in 2013, of 1,347,150, for a population density of inhabitants/km, one of the lowest in Spain. The most densely populated areas are around the valley of the Ebro river, particularly around Zaragoza, and in the Pyrenean s (the hills at the base of the Pyrenees), while the areas with the fewest inhabitants tend to be those that are higher up in the Pyrenean mountains, and in most of the southern province of Teruel.