Gibraltar's been mentioned a few times, but Ceuta has only come up once (brief mention by @Diforto in post 13). It's not as defensible as Gibraltar, but a bit bigger and obviously in just as good a location trade-wise. It was a free port up to as recently as 1986 (when Spain joined the EEC), so some extra chaos in Spain at some point could lead to it going it alone - maybe as a result of one of the Carlist Wars?
The problem would be keeping it independent from Morocco without the Spanish to support it.
The same could apply to Melilla too.
The problem would be keeping it independent from Morocco without the Spanish to support it.
The same could apply to Melilla too.