Final answer:
From north to south, the four viticultural appellations of Portugal are Porto, Dão, Alentejo, and Lagoa, with Porto being the northernmost and Lagoa the southernmost.
Step-by-step explanation:
The four viticultural appellations of Portugal in geographic order from north to south are: Porto, Dão, Alentejo, and Lagoa. Porto is located in the northern part of Portugal, known for its famous Port wine. Moving southward, the Dão region is situated in north-central Portugal, renowned for its high-quality table wines. Further south lies the vast Alentejo region, encompassing much of south-central Portugal and known for its cork oak forests and wine production. Finally, the southernmost appellation, Lagoa, is part of the Algarve region, famous for its beaches and, to a lesser extent, its wine.