Los Machucos, o Colláu Espina, is a mountain pass in the easternmost sector of the Cantabrian Mountains, known as the Pas Mountains, in Cantabria, Spain.
It is located at 921 metres above sea level and communicates the villages of Bustablado and San Roque de Riomiera. It is known for its slopes between 15-20%, reaching 28% at certain points. At the summit, there is a Monument to the Pasiega cattle.
Source: Wikipedia.org
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