Once upon a time when land was cheap (yes ... that is how
old I am), I bought land in the form of a big V. At the bottom
of the V, there were wild plants, raspberries and a big hole.
Sometime this is going to be a pond I said.
The main reason to have a pond was to collect water. In my
home town it rains 700mm (27.5") per year which is not much,
and water is expensive to use it to grow tomatoes. So whatever
rain water I could get, the more things I could grow.