If you're willing to revisit the Frances, Pamplona to Logrono fit your timeframe perfectly. Start at cathedral. End at Iglesia de Santa Maria la Redonda in Logrono with crucifixion painting by Michaelangelo. If you have the time/stamina take...
My first thought was the Ingles, because that gives you a "complete" Camino.
But when I read that you are looking for a more religious Camino, my thoughts shifted to the Portugues, from Tui or Vigo, because they would lead you through Padron...
I agree the Portuguese Spiritual Variant would be a very good choice. However, the boat ride from Vilanova de Arousa to Padron was (spiritually) disappointing, much so that my wife and I plan to do the alternative walking stage next time...
As you state that a spiritual Camino is what you’re looking for, I’m going to second the recommendation of @jungleboy. I certainly enjoyed walking the Inglés, but from the more spiritual perspective I’d suggest a walk that included the Variante...
If it is, my last 100km suggestion is always the Portuguese + Variante Espiritual.
A five-day plan could look like this:
1. Tui-Mos 23km
2. Mos-Pontevedra 29.4km
3. Pontevedra-Armenteira 20.5km
4. Armenteira-Vilanova de Arousa 23.7km
5...
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