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The climbing starts in the tiny village of GĂ©rgal. The climb is about 25 km long, and while never steep, itâs not the easy climb you expect it to be when you look at the climb profile.

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The first part is quite tough but gradually eases off. Roads are decent on this side (the same canât be said from the other side), but they get worse as you get closer to the top.
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The road just keeps going and there never seems to be any sign of the summit. Only one 1 or two places can you actually see the domes of the observatory, but then you still have a long way to go.
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And when you think youâre at the summit, you enter a forested area on a plateau, and youâre still climbing, even above the 2,000m altitude mark. At the end are a couple of nasty stretches uphill; nothing really bad but your legs will probably start to hurt by now.
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And then, almost out of nowhere, you see the majestic domes of the observatory in an otherwordly landscape. It really is something special, this place. After riding around the domes for a little bit, itâs time to fly down the other side of the mountain, which is definitely the harder (but shorter) side.
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If youâre keen, you can inverse the route, and begin with the climb of the Alto de Velefique, ride to Bacares, and head to the Calar Alto, to descend down the western flank of the mountain. Monster ride or not, this is a really cool ride thatâs worth the trip to this remote area.
Fueling
Youâre in the desert, so donât expect many places to rest. GĂ©rgal has a few places where you could stop for a drink and a bite. Unless Iâm mistaken, Aulago, a village on route, does not have a cafeteria. It had a restaurant, but that seems to be closed now.