second national park created in Spain, in 1918, it is found in the Pyrenees in the comarca of Sobrarbe, occupies an area of , a part of the of the peripheral area of protection. It also enjoys other figures of protection like the Biosphere Reserve of Ordesa-Viñamala and is cataloged as a World Heritage Site by UNESCO. In addition there are other 4 natural parks: the Moncayo Natural Park with an extension of , the Sierra y Cañones de Guara Natural Park with and of peripheral area of protection, the Posets-Maladeta Natural Park with and of peripheral area of protection, and the Valles Occidentales Natural Park with and of peripheral area of protection. There are also three nature reserves, five natural monuments and three protected landscapes. Aiguabarreig Segre-Cinca-Ebro At the confluence of the Segre and Ebro rivers, the Aiguabarreig Ebro-Segre-Cinca is a space with great natural wealth and a great variety of ecosystems that range from Mediterranean steppes to impenetrable riverside forests, making this space a paradise for biodiversity. Territorially, the Aiguabarreig is at the center of the Middle Depression of the Ebro. It borders to the west with the Monegros, to the east with the Tossals de Montmeneu and Almatret and to the south with the tail of the Ribarroja reservoir. This space is named with Catalan word of origin that designates the place where two or more water streams meet and form one. The Segre and Cinca form a first Aiguabarreig between the towns of La Granja d'Escarp, Massalcoreig and Torrente de Cinca, a few kilometers downstream they converge with the waters of the Ebro, already in the municipality of Mequinenza, forming one of the largest river confluences of the entire Iberian Peninsula. History Aragon, occupying the northeast of the Iberian Peninsula has served as a bridge between the Mediterranean Sea, the peninsular center and the coasts of the Cantabrian Sea. The human presence in the lands that today form the autonomous community date back several millennia, but present-day Aragon, like many of the current historical nationalities, was formed during the Middle Ages. Prehistory The oldest testimonies of human life in the lands that today make up Aragon go back to the time of the glaciations, in the Pleistocene, some years ago. This population left the Acheulean industry that found its best weapons in the hand axes of flint or the cleavers of quartzite. In the Upper Palaeolithic