Technically, a pond is man made, and a lake is natural, but size has long been what most use to define a lake and pond. Some areas say 5 acres plus, and other areas say 10 acres plus to be a lake. Depth can also be part of the differences in definitions. Some states define a "lake" by size (Maine defines a lake as 10 acres surface area or more)
If you own it, call it whatever you like!
