Questions on Irrisen Affinity, Korvosa Affinity, etc.

[Rerednaw]

First of all...what are they? Feats? Traits? I cannot find them except listed as a prerequisite (usually for other feats). Where are they spelled out (book, page#) in the rules section?

Second, any specific rules quirks when used in Society Play?

Thanks!

[Starglim]

Pathfinder Campaign Setting page 5 wrote:

All of the nations in Chapter 2 present local feats. A local feat can only be selected for a nation in which the character grew up or for which he otherwise possesses local affinity.

To gain local affinity, a character must live in a nation for at least a year and gain at least 2 ranks in Knowledge (local) while there. After that time, he is considered to have affinity for that nation for the purpose of qualifying for certain feats (although, of course, he must meet the feat’s other prerequisites as well).

For some reason, the PDF has a character in the middle of each occurrence of "affinity" in this text, so a search doesn't find this. "local feat" works.

This means that a character can have only one local affinity at 1st level and can qualify for another one at each even level, at minimum. PFS doesn't specify where the character lives between adventures, so I think you could choose to live in a different nation for each two levels.