At her blog, hbdchick has a discussion of the north-south division in Spain where she asks if there are any differences in IQ that show up.  I suggested looking through the 2009 PISA results, which she did.  To follow up, I decided to map out the results for Spain and Italy.  For each map, the pure black is 400 and pure white is 525 (a scale I came up with before I realized that Lombardy had a 526 average science score).  To start, here are the maps for Reading scores:
It is worth noting that PISA did not release the scores for three autonomous communities in Spain: Extremadura, Castile-La Mancha, and Valencia, which form a band immediately to the north of Andalusia and Murcia. I’ve made those three mostly transparent.

For Mathematics:
For Science:
Finally, this pair of maps integrates the data from all three areas, with the red channel being Reading, green Mathematics, and blue Science.  As above, the lighter a region, the higher it’s scores were, but in addition, its hue reflects the areas of the test where students did comparably better.  For instance, many of the provinces in northern Italy have a slight bluish hue and that’s a result of having comparably good science scores and comparably poor reading scores:
Here’s the raw data for the maps above:
Region Reading Mathematics Science

Spain

Andalusia 458 462 469
Aragon 492 506 505
Asturias 492 494 502
Balearic Islands 461 464 461
Basque Country 496 495 495
Canary Islands 444 435 452
Cantabria 488 495 500
Castile and Leon 507 514 516
Catalonia 499 496 497
Ceuta and Melilla 403 417 416
Galicia 483 489 506
La Rioja 488 504 509
Madrid 499 496 508
Murcia 484 478 484
Navarre 495 511 509

Italy

Abruzzo 481 476 480
Aosta Valley 506 502 521
Apulia 488 488 490
Basilicata 473 474 466
Bolzano 497 507 513
Calabria 449 442 443
Emilia-Romagna 496 503 508
Friuli-Venezia Giulia 507 510 524
Lazio 474 473 482
Liguria 480 491 498
Lombardy 514 516 526
Marches 492 499 504
Molise 465 467 469
Piedmont 487 493 501
Sardinia 469 456 474
Sicily 451 450 451
Trento 500 514 523
Tuscany 487 493 500
Umbria 484 486 497
Veneto 505 508 518
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