Señorio de Bertiz

Señorío de Bértiz Natural Park protects an exceptional Atlantic forest in the Bertizarana valley of northern Navarra, encompassing approximately 2,040 hectares of ancient deciduous woodland donated to the Navarra regional government in 1949 by its last private owner, Pedro Ciga, who stipulated it be preserved and used for recreational, educational, and scientific purposes. ^[1] 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. ^[1] Otter inhabits the Bidasoa River that forms the southern boundary of 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. ^[1] The forest understory is rich in ferns, mosses, and spring-flowering plants, while the river margins support alder and willow galleries. The botanical garden, established by Pedro Ciga, contains exotic tree specimens from across the world collected during the 19th and early 20th centuries.

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 señorío (lordship) for centuries, passing to Pedro Ciga who acquired it in 1889 and developed the botanical garden with over 120 exotic species from different continents while allowing the native forest to mature. ^[1] In 1949, Ciga bequeathed the estate to the Diputación Foral de Navarra with the condition that it be preserved unchanged and used exclusively for recreational, educational, and scientific purposes—conditions that directly shaped what became one of Navarra's finest protected areas.

Designated a Natural Park on 25 March 1984, following its donation to public ownership by the estate's last private owner, creating one of the best-protected Atlantic forests in Navarra. ^[1] 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. ^[1] The Bidasoa riverside path and the ascent to viewpoints above the canopy offer different perspectives on the woodland landscape.

Located in the Bertizarana 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. ^[1]

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. ^[1]