it joins the river of Ebro. Aturri, which joins the sea in the coast of Basque Country, is the largest river and has the biggest water flow. Its source is in Tourmalet and it joins the sea in Baiona, crosses 335 km of land, the last 30 km of which are in Basque Country. It has several tributaries from the Pyrenees, including the Biduze, Errobi, and Aran. Like Aturri, other Basque rivers join the sea in the Bay of Biscay, such as Nerbioi, Bidasoa, Oria, Deba, Urola, and Urumea. The Nerbioi is the longest such river in the Basque Country, with a length of 75 km. Forests The forest of Irati is the largest in the Basque Country, and one of the main beech forests in Europe. It covers parts of Lower Navarre, Zuberoa and Spanish Navarre. Otherwise, from Sakana to Aezkoa extending all over the north of Navarre, deciduous forests abound. These breed of trees can be also found on the east of Álava, in the region called Mendialdea and Araialdea, and in Zuberoa and Lower Navarre. They exist in Gipuzkoa too, in the middle of Urola and in Aralar. In Biscay, there are evergreen forests throughout 66% of the province. The main exceptions of this are some places of Enkarterri and in Durango (Urkiola Natural Park). In Gipuzkoa, 56% of the trees there are conifers, but in Álava they consist of only 28% of the trees. Currently, 55% of Basque Country is covered by trees, and in Navarre the figure is 45%. Desert The natural park of Barde is the biggest desert, and is located in the south east of Navarre. It is 41.845 hectares in area. It is 45 km from north to south, and 24 km from west to east. Geographical landscapes Gaztelugatxe Bilbao Donostia Irati Forest Urdaibai estuary Oma forest Santimamiñe Iruñea Goierri See also Iberian peninsula Geography of Europe Sierra Salvada Geography of Europe