I had no idea idea what water tables were and now I find out.. well now I click.. that ofc there's water under land! It didn't occur to me. So it's the bit where the groundwater meets the soil?

That means we have water on water below us. The fresh groundwater and the ocean that our land floats on top of. You also don't really think of diving under a country do you. I've gone on a tangent..

Aah yes water above and below 😌