keld

springs laid deterministically off the world seed at honest flat sites: a gravel and clay floor, a cobble and mossy-cobble rim, and water that stays open all winter while the ice takes everything around it. in summer it runs cool. the steam is the tell you can see from a ridge.

and twice a day the drinking hour: dawn and dusk, the land's animals file down to the rim under an old truce, at a goal priority that actually wins against whatever else they had planned. stand still and watch it happen; that is the whole feature.