The Basque Country is blessed with stunning natural features that appeal to every kind of nature lover: expansive beaches for ocean-dwellers, rolling hills for the trekking-type, and gorgeous mountains for the alpinistas. Gorbeia National Park combines all three elements: sprawling paths through tranquil, wooded areas and aerial ocean views to reward those determined enough to reach the tallest summit in Bizkaia.
You can find route descriptions here. The following photos are from the Menhir de Arlobi track, originating in Álava.
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