I retired Gaterider, the fortress on the evil volcano "The Tower of Immortality" shortly after completing the weaponized volcano. Things stabilized, but, I am in the process of trying to drag this dwarven civilization (The evicerated bolts) back from the edge of extinction, and having 80% of my migrants die almost as soon as they spawn on the map was.... somewhat counterproductive.
Efforts to breathe life into this civ have gone fairly well, though. Unfortunately, we're at war with 2 elven civilizations, and with the other dwarven civilization in this world, so, there is no safe place to embark, really. Regardless, our population is slowly climbing. The old capital has a population of 75, up from 40 or so a few years ago. The only other sites we have are fortresses I've retired. Of them, stakeplunged seems to be doing well for itself, with a listed population on the civ map of ~400 (retired at 200 or so, and many of the migrants to the last 2 forts have been from there.) Even the evil volcano site has shown a general upwards trend, being listed now at ~100 (retired at 30.)
Our new fortress, Berrash "Earthendeaths" has grown rapidly to 124 dwarves over the last 2 years, 46 of which are children, some of whom I hope to raise to adulthood here, and train to be useful to the civilization's survival. We embarked in a swamp in the south-west, far from the elves and opposing dwarves. Our only neighbors seem to be the goblins of "The Hex of Mucus" who sent a "siege" consisting of... 9 goblins. Not very impressive, as far as threats go, but this map only has copper, platinum, and silver, so, our military isn't as well protected from their weapons as I would like. We'll be importing as much iron and steel as we can to remedy this. We're on good terms with the humans, but, our civilization exists only in places well outside their merchant's range of travel, so, we've yet to meet any of them in any of these forts.
This fortress is in The Swamps of Wishing, The site is bisected by a small 4-tile-wide stream, which freezes in autumn, and thaws in mid-spring. This area has a 7 Z-level deep light aquifer in the sandstone layers (which we've taken advantage of to create a near-constant pleasant mist at our main entrance in the cavern layer. Above the aquifer is 2 layers of clay and one of soil, so we've had a fairly easy go at farming here. The influx of legendary metalcrafters, metalsmiths, armourers, and weaponsmiths from previous forts has helped our wealth grow rapidly in a very short time, and while the copper may not make for the best armour, at least it's of the best quality a dwarf could hope for.
I think our next major project will be to try to do some exploratory mining in the layers of aquifer-stone, we've seen some platinum in the sandstone walls, where the aquifer overlaps with the caverns, and I think that alone is enough to motivate the miners to agree too getting a little wet. If we establish proper drainage, it shouldn't be too difficult, it is only a light aquifer afterall. Maybe we'll get lucky and find some iron ore as well, which would certainly help our military out quite a bit, The presence of platinum has me hopeful that we may have some magnetite hidden above our heads...