Los Machucos
{{Short description|Mountain pass in the Cantabrian Mountains}}
{{Infobox mountain pass
| name = Los Machucos / Colláu Espina
| photo =
| photo_caption =
| elevation_m = 921
| elevation_ref =
| traversed =
| range = Cantabrian Mountains
| coordinates = {{coord|43|15|27|N|03|39|11|W|region:ES_type:pass|display=inline,title}}
| topo =
|map= Spain
}}
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.{{Cite web|url=http://www.dangerousroads.org/europe/spain/6934-los-machucos.html|title=Los Machucos|website=www.dangerousroads.org|language=en-gb|access-date=2017-11-05}}
It is located at {{convert|921|m|ft|0}} above sea level and communicates the villages of Bustablado and San Roque de Riomiera. It is known for its slopes between 15 and 20%, reaching 28% at certain points. At the summit, there is a Monument to the Pasiega cattle.{{Cite web|url=http://www.cyclingnews.com/news/vuelta-a-espana-to-scale-28-per-cent-los-machucos-wall/|title=Vuelta a Espana to scale 28 per cent los Machucos wall|date=6 September 2017}}
In cycling, it was climbed for the first time in the 2017 Vuelta a España, when it was used as the finish of stage 17.{{Cite web|url=https://www.cyclingstage.com/vuelta-2017-route/stage-17-spain-route-2017/|title=Vuelta 2017 Route stage 17: Villadiego - Los Machucos|website=Cyclingstage.com|access-date=2017-11-05}}{{Cite news|url=http://www.velonews.com/2017/09/vuelta-a-espana/los-machucos-vueltas-latest-discovery_447420|title=Los Machucos, the Vuelta's latest discovery {{!}} VeloNews.com|date=2017-09-05|work=VeloNews.com|access-date=2017-11-05|language=en-US}} Los Machucos was also featured as a stage finish in the 2019 Vuelta a España.