I saw this from a distance and wasn’t sure what I was looking at until I got close
That is waaaaay too many winged ants.
I know a spot near the river where, as soon as an ant nest swarms and sends up the winged ants, a tornado of dragonflies converges on them and eats them all. You can grab twigs and stuff covered in ants and make a flicking motion to throw the ants and the dragonflies eat them before they touch the ground. Fun way to help keep invasive ants from spreading any further.