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https://www.lfgss.com/comments/17568795/
road only
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Then, personally, I'd bash over the Pyrenees. I've been talking about another go, as a tour with the missus for a while. Maybe doing it from San Seb towards the east instead this time. Steal the TPR route or http://www.ccb-cyclo.fr/en/raid-pyreneenÂ.html route.
But equally, the area where the Vacant Mountains routes are still has plenty of roads so you could make some really nice, low-traffic routes down there.
I can't remember if you're on or off road?
I'm lazy so I mostly copy other people's routes/ideas unless it's a race. I've loved Transiberica and Transpyrenees and off-road stuff near Amposta and Ernesto / Vacant Mountains from https://bikepacking.com/routes/montanas-vacias/ and https://bikepacking.com/routes/altravesur-bikepacking-route/
Also off-road El Piri is a tough but stunning route/event by @skinny start/finish in Girona. Badlands down south was cool - Sierra Nevadas are your southern lumpy options (Granada)
https://www.transandalus.org/#!/
https://bikepacking.com/routes/bikepacking-transnevada-southern-spain/
https://montanasvacias.com/xl-eng/ (various routes, mostly around Tereul)
https://granguanche.com/audax/audaxtrail/ (Canaries road/offroad routes)
Raid Pyrenean http://www.ccb-cyclo.fr/en/raid-pyreneen.html
Offroad https://iberica-traversa.com/
https://bikepacking.com/routes/iberica-norte/
https://raceacrossseries.com/en/race-across-spain-2025/
Anyway, just look at some of these for pictures and routes and see what tickles your fancy based on what you like riding.