do you have the core rulebook? because it goes into some of the details about elvenhome, the kindreds, and so on.
first, lets throw a map up so we can get our bearings.
The Continent of Mantica
i’ll condense the backstory, but basically the elves, like men and dwarves, learned a lot from the Celstials, being of immense power. which lead to vast kingdoms of each race. the breaking of that mirror, and the chaos that followed because of the shattering of the celestials into light and dark forms, hit the elves pretty hard. most of their old kingdom now lies under the Infant Sea. south of that sea you have elvenhome, the center of the surviving elvish realm. you also the Brokenwall islands as a bit of the area around the euhedral library as elvish areas. really, it is indicated that there are elvish held lands all over the map (the forest of Galahir for example), but the big one is Elvenhome.
the Kindreds are basically regional variations of elves from across their empire, many of which have been idplaces by the sea. imagine if the british islands sank and everyone there had to move to scotland. they are all english but you have the welsh english and the english english and the scots english and so on, each with their own dialects, accents, traditions, and the like.
western kindrids get described as being “sea elfs”, fortifying the city of walldeep (an old elvish city that was walled around by rock via magic to protect it from the sea rising. with the city lying well below sealevel but the tops of the walls being 40+ yards above) and the broken wall islands, and using many ships to patrol the coasts and sea.
the northern kindreds are described as isolationist and independant, unliek the western and eastern kindreds which stand together. the northen kindred is actually split, with an exiled prince that led many of their kind far to the north to settle in the Bitter lands and winterlands. (“ice mountains” on that map. it is liekly that at least part of these elves are i nthe northern Alliance faction we are getting with 3rd ed.)
the eastern kindreds once lived on Savannah, but the ophidian desert is now spreading across their land. the eastern kindred are described as nomadic, and riders of “drakons”, great beasts which were once native to their land.
the southern kindreds don’t get much mention aside from the fact that the desert has already consumed most of their lands, leaving only a few cities where the surrounding greenery and good conditions are protected by magic.
the Mouth of leith is described as the home of the “dark kin”, elves who turned their back on “all that is good” during the godwar. the location is a shadowy place, the mouth of a deep ‘underworld’ where strange things roam.
the forest of Galahir in the north is a realm of ‘forest elves’, the sylvan kin, who embraced nature and rejected things like stone cities. they embraced the green lady, one of the gods created during the godwar, and she protected the forest during the glacial onslaught during the war of winter.
so really, the main book doesn’t provide much material either. we do have some interesting elements to work with though. the southern kindred are basically desert elves living in magical oasis-cities, so perhaps a middle eastern feel to them, the western kindred are nomads and beast riders, so they might well have a bit of a Mongol or Turkic feel?