This area of ancient elven settlement is named for the elegant stone gateways scattered in and around the forest town. Sevenarches is now a human habitation, and has been for thousands of years, since the sect of Oakstewards took over the land from the elves who failed it. Indeed, the Oakstewards especially forbid elves and other outsiders from visiting, and are quite strict in who and what they allow to approach Sevenarches. The stones still thin the walls of the First World here, leading to a preponderance of druidic worship and many fey creatures and treants visiting the region. Stories claim that the arches each once led to another world, and the elven council of Kyonin hopes to reclaim them and complete or restore the work begun on them long ago. So far, the elves remain unwilling to exterminate the human presence there, but at some point the idea of genocide might carry the day, especially as the Oakstewards grow increasingly rigid and intolerant with each passing century.
Sources: Pathfinder Chronicles Campaign Setting