The small town of Burgui is the southern gateway to the Roncal valley. The village is characterised by its cobbled streets and large houses with curved tiles, pointed roofs and protruding eaves. The Roman bridge at the entry to the town is a real picture-postcard structure. It still conserves its four original arches and its ancient camber and cutwaters that slice through the river Esca. Just a few metres upstream is a small dam or ‘port’ where almadías (rafts) used to ‘jump’ loaded with timber, the other main activity of the valley together with stockbreeding. Nearby are important natural resources such as the ponds of Sasi or the gorge of Burgui, declared a Nature Reserve .