**Lastur** ::naturaleza 
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The valley of Lastur, in Deba, lies within a karst landscape formed by the dissolution of limestone created 110 million years ago. This terrain, full of sinkholes, caves, and underground channels, includes an interpretive centre explaining its geological history and the valley’s close relationship with stone, water, caves, and local traditions. For centuries, stone extraction was its main activity, and the area became known for the skill of its stonemasons. The ironworking industry documented since 1335 eventually gave way to the Plazaloa mills, which remain well preserved and open to visitors.
Lastur is also closely linked to Basque bullfighting. The betizu, the Basque wild bull —one of the last wild cattle in Europe— has long inhabited the surrounding mountains. The neighbourhood square, one of the oldest in the Basque Country, still hosts festivities and bull events every September. From this same spot starts the PR-46 Karst Route, a striking geological and scenic path that crosses the heart of the geopark.

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