Despite the mountains are lower, the forest is amazing. The regular rainfall of this region helps. Atlantic brings lot of clouds is this area, fog is very normal. The number of days of precipitation is high for the iberian standards, more than 150 days in the wettest areas. The highest rainfall of Peninsula are here in Azpilicueta. In Galicia there are also some points with similar rainfall but summer is more dry, even in the south of Spain the Grazalema mountains have very high rainfall but the rain is in 6 months, summer is really dry.
The highest mountains of Navarra are in the west, were the main village is Isaba. Is the Belagua Valley the most rocky area of this area of the Pyrenees.
The best forest of the region and for me one of the best in the Pyrenees is the Irati forest. Is a huge forest area, that also cross the border. The used these furniture for made the “ Armada invencible”. Lot of ships to fight against England. Even you can visit some historic buildings inside the huge Irati forest.
Roncesvalles is the village where the main Sant James way starts. Is a nice area very green.
Also in the north of the region there are rituals and legends about witches. There is a cave to visit in the Batzan valley, not very high mountains but very interesting visit..