What is the difference in nuance between "on a farm" and "in a farm"?

Rebecca

Prepositions in English are very idiomatic, so when referring to farms, the preposition we use in English is usually "on" and is never "in". However, when referring to cities and towns, the preposition is usually "in". In most cases, "in a farm" doesn't exist as it sounds very unnatural. Here are a few examples of "on a farm": Ex: I have several cows on my farm. Ex: They live together on a farm.