My neighbor friend likes to refer to my 1.2 acre Pond as a Lake, as if he's correcting me when I call it a pond.
The conundrum is usually pondered over a cocktail or two as we take a break from solving the rest of the worlds problems.

He asks, how I know the difference? My response, if it's too small for water skiing - it's a Pond!

His response is more compelling. If it has a source, other than rain, like a spring or creek - it's a lake.
"Ponds can dry up in a drought, lakes don't", he says.

It's spring fed, I still call it a Pond.

What is it?