Map of Spanish PISA results via /u/bulfcc on Reddit:
As usual, clear N-S gradient, if not as steep as in Italy.
Incidentally, the north is in demographic free-fall (2x deaths as births), while the south is stable (births~=deaths).
Not good, but a predictable pattern.
One surprisingly take away from the regional Portuguese IQ results is that Lisbon may be the single largest concentration of cognitive ability in the Iberian peninsula. OTOH, the rest of the country is similar to Southern Spain.
Spain has recently started to do marginally worse than Portugal in PISA assessments, though one must also adjust for Spain having more in the way of low quality immigrants.
Still, this does seem to be a good sign for Portugal moving some way to closing its inexplicably large productivity gap with Spain.