The Kingdom of Vestland

Overall
Vestland is a nice place. It's still an hereditary monarchy, but society is much more open than Ostland and the king appoints an advisory council of representatives from different social strata, professions, and other special interest groups. The Jarl of Rhoona uses the southern title "Duke" as an affectation. The country's excellent trade routes mean that it's a prosperous place, and slavery is outlawed. Religion here is mostly the worship of Frey and Freyja, another pair of Immortals.

We're told that the not-Vikings are a sea going people with far ranging expeditions to both trade and raid; and that they have strong trade links with the dwarves of Rockhome. There is a sizeable dwarven minority in the area, and the palace of Duke Stephen Rhoona is being built by dwarves.

We're told that the architecture of the country is wooden houses, with mixed farming (sheep, goats, cows, horses, barley, rye) and it's famous for its beer.

There are also quite a few immigrants from the Ethengar Khanate over the hills to the north, who come to trade horses and sometimes settle.

We're told that there are two main temples - that of Forsetta (Temple to Frey and Freyja), who teaches that good deeds are rewarded in the afterlife; and that of the Spuming Nooga which seems to be a sea-based druidic order of sorts (although there are no druids in basic D&D yet, so it's technically just a nature-oriented clerical religion). Recently, the immigrant Ethengarians have erected a temple to Cretia, their god.

 
 * Proteus is also The Old Man of the Sea and The Spuming Nooga, yes.)
 * first High King of Vestland was Ottar the Just, who was given the crown (called the "Sorona" or "Crown of the Sun") by the immortal Thor after the defeat of the Ostland army. This apparently happened at a henge in the north of the country called the Stones of the Sky, and the first Patriarch of Ruthin did the crowning. The henge itself is much older and of unknown provenance.