Assume ant is the size of one cubic millimeter. There are 1000 milimeters in a meter. There are 1000 meters in a kilometer. The ants in your yard occupy 23 cubic meters of space. If the number of ants in your yard were spread flat across it, they would cover 5.68 acres, or .023 square km, or 23000 square m. I had Google do the heavy lifting.

To put that into perspective, a meter is about three feet, and a bit, but who's counting.

Anyway, If you happen to be six foot tall, that makes you slightly short of two meters. 23/2 is about eleven, so if we stack the ants in your yard in blocks two meters high, and then place them in a three by three and a bit, rectangle, then if you lie down and measure yourself, three times, in two directions, stand up, draw a square, and look at it, then imagine that the square is filled with ants up to your eye level, and you have a sense of exactly how many ants you have in your yard.

That's over a nine by nine by six foot room, filled with ants.

You have an ant problem.

Anyways. You're everywhere right now.