There's a sand dune on one of the stages of the Camino do faros.

[Stephen]

It's quite a climb, one step upwards half a pace slipping back in the fine sand.
Anyone know how high it is?
When you come down from the dune you join a road and can see the lighthouse at Cabo Vilan in the distance.

 

[lt56ny]

I am not sure about this but there were more than a couple of paths to the beach that I skipped because they were steep and I didn't want to risk it.

 

[seth from somewhere]

I'm fairly certain you are referring to Monte Branco near Praia do Trece and Cementerio dos Ingleses. They've just re-routed the Camiño to avoid this sand dune to aid conservation efforts as it's a delicate ecosystem.

El Concello de Camariñas actuará para proteger la duna de Monte Branco

Han decidido modificar el itinerario entre Santa Mariña y el Cemiterio dos Ingleses, una ruta incluida en el Camiño dos Faros

www.google.com

 

[seth from somewhere]

On second thought, you might be referring to another area past Monte Branco and Area do Trece. If so, it's Monte da Pedrosa, and according to Wikiloc it's a 60 meter climb in half a kilometer. It's not really a sand dune, though.