IronDeer Gravel Challenge: 130km Mountain & Coast Loop

One hundred and thirty kilometres, around 2,200 metres of climbing, roughly 70% gravel and 30% road. A private guided loop out of Nazaré that goes up into the Serra dos Candeeiros wind-farm ridge, drops into the limestone karst of the Aire and Candeeiros Nature Park, and comes back along the Atlantic via the Óbidos lagoon and São Martinho do Porto. It is the longest, hardest day we run.

Read this before you book

If 100 kilometres on mixed surface is your current ceiling, this is not the day to test 130. The combination of distance, climbing and exposure on the ridge is unforgiving when you fade. The riders who do this well have several 130+ days in their season already, ride gravel comfortably on loose surface, and turn up rested. If you are not sure, the 90km Nazaré-Fátima gravel loop is the right starter.

There is no support van. There is no follow car. You ride with your guide and a small group on a self-supported day. Two bidons each. Your guide carries the workshop saddlebag (tubeless plugs, a spare tube, a chain link, a multi-tool, a pump). Resupply happens at café stops along the route. This is part of what the day is.

The bike for it

We run the route on carbon gravel cycling Portugal bikes set up specifically for it: a Shimano GRX 1×11 drivetrain with a 40t or 42t cassette for the long limestone climbs, 40c tubeless gravel tyres at low pressure for the loose surface up on the ridge, hydraulic disc brakes for the descents off Candeeiros. You bring your own pedals if you have a preference, and your own bib shorts. Everything else is on the bike.

The climb to the ridge

Out of Nazaré the route runs inland through Pataias and Reguengo do Fetal, picking up the first gravel inside the first hour. The opening climb is through Pinhal de Leiria pine plantation: fire road, eucalyptus dust on the back of the throat after the first kilometre of the singletrack section, the smell of resin baked into everything in summer. It is steady work. You settle into a pace and you stay there.

The road then lifts toward the Candeeiros ridge proper. Surface deteriorates: looser white limestone, occasional ruts, exposed rock. This is where the GRX groupset earns its place. The gearing lets you sit and spin rather than grind out of the saddle. The wind picks up well before you can see the turbines.

The wind-farm ridge

On top of the Serra dos Candeeiros the wind-farm ridge runs for kilometres. The turbines are the obvious feature, but the silence between their sweeps is what you notice. That, and the openness, and the limestone hills falling away on both sides toward the Atlantic glittering somewhere far to the west. The headwind here is honest. On a bad day it slows you to a crawl. On a calm day you fly. Your guide knows which sections to push and which to soft-pedal.

The descent off the ridge into Porto de Mós is the reward: fast, rolling, the green-tiled castle visible from a long way out. This is the natural lunch stop. A proper meal here, water bottles refilled, an honest reset before the second half of the day.

Down to the lagoon, back to the coast

The afternoon section is technically easier and tactically harder. Surface improves — more clean gravel, more road — but the legs are well into their day. The route drops south toward Caldas da Rainha and the Óbidos lagoon, where the path crosses farmland, dunes and short coastal wetlands. The light here in late afternoon is the one to ride for: low gold, long shadows, the lagoon flat and reflecting.

From Foz do Arelho you turn north up the coast. São Martinho do Porto sits in its scallop-shaped bay around kilometre 110, a possible stop for water and a coffee depending on how the day has gone. The last 20 kilometres roll along the coast back to Nazaré with the wind, usually, behind you. You feel the salt return to the air around the last climb.

Logistics and seasons

You and the guide agree the start time when you book: first light in summer, more flexible from March through June and September through November, which are the ideal months. Group is small by design. Pace, café stops and how long you spend on the ridge adapt to the group on the day. The route itself is fixed. Expect 7 to 9 hours of riding, plus stops.

Eat properly the night before. Eat properly that morning. Eat properly on the bike, every 30 to 40 minutes once the climbing starts. Carry a packable shell. The wind on the ridge can flip cool fast in spring and autumn. Sun cream goes on before you start in summer. After 130 kilometres of gravel and 2,200 metres of climbing, the cold beer back in Nazaré is the one you have earned.