There is a planet of mysterious black-haired aliens (and sometimes orange-haired aliens and all of them if they live long enough become white-haired aliens) in a borderline-seasonable orbit around a smallish yellow star, sporting a nitrogen-oxygen atmosphere and extensive liquid water oceans. There is one natural satellite; there are no artificial satellites. Nighttime lighting is sparse and consistent with fires. There's no sign of railroads. No one is using radio.

Many of the aliens build settlements and practice agriculture. Most of their settlements would make a red neighborhood seem unbelievably clean. There are two pockets of unusual cleanliness on the planet, one city that no one actually seems to live in which exists for ritual purposes and, far away from there, a region where things seem... slightly better? Substantial effort has gone into keeping the cities... less unclean... and on the basis of counting individuals of different sizes it maybe looks like they might be doing something like population control? Hard to tell when at their tech level a sensible population policy still involves a lot of babies and rather fewer older children.

In that slightly more promising region, there's a strip of not quite untouched but definitely mostly avoided wilderness cutting off a peninsula from the rest of the land. There are people on both sides of it, armed with preindustrial weapons, not at this specific moment killing each other. Yet.