Señorio de Bertiz

Señorio de Bertiz Natural Park protects an exceptional Atlantic forest in the Baztan valley of northern Navarra, encompassing approximately 2,040 hectares of ancient deciduous woodland donated to the Navarra government in 1949 by its last private owner. The park preserves one of the finest examples of Atlantic forest in the western Pyrenees, with mature beech, oak, and chestnut woodland in conditions approaching virgin forest in the less accessible areas. The former estate's botanical garden and palace grounds add a cultural dimension to this predominantly natural park.

The mature forest supports pine marten, wildcat, genet, and several dormouse species, while the abundant deadwood and old trees provide habitat for the middle spotted woodpecker and other cavity-nesting birds. Otter inhabits the Bidasoa River that bounds the park, and the dense forest hosts diverse populations of woodland birds including goshawk, honey buzzard, and black woodpecker.

Beech dominates the higher slopes, with sessile oak, sweet chestnut, and ash creating diverse mixed woodland at lower elevations. The forest understory is rich in ferns, mosses, and spring-flowering plants, while the river margins support alder and willow galleries. The botanical garden contains exotic tree specimens collected by the estate's owners during the 19th century.

The park occupies a valley carved through Paleozoic sandstones and shales that produce the deep, acidic soils favoring Atlantic forest development. The gentle terrain compared to the surrounding mountains facilitated the preservation of continuous forest cover.

Hyper-oceanic climate with over 1,500 millimeters of annual rainfall distributed throughout the year, maintaining the permanently humid conditions that support the lush Atlantic forest. Temperatures are mild year-round with rare frost.

The estate was managed as a private señorio (lordship) for centuries, with the enlightened management of its last owners preserving the forest from commercial exploitation and establishing the botanical garden that enhances the park today.

Designated a Natural Park in 1984 following its donation to public ownership by the estate's childless owner, creating one of the best-protected Atlantic forests in Navarra. The park's origin as a private estate explains its exceptional preservation.

Walking routes through the mature forest and the historic botanical garden provide the main visitor experience. The Bidasoa riverside path and the ascent to viewpoints above the canopy offer different perspectives on the woodland landscape.

Located in the Baztan valley near Oieregi, approximately 50 minutes from Pamplona. The visitor center in the former estate buildings provides interpretation and garden access. The park is well-signposted from the N-121-B.

Non-intervention forest management in core areas allows natural processes of tree death and regeneration to create old-growth structure. Exotic species from the botanical garden are prevented from spreading into the native forest. The park demonstrates the conservation value of former private estates managed with long-term vision.