APPLE MAPS-Is it possible to save multiple Pins to a singular location on my iPhone.

I have the same issue. It seems to be a limitation in the application itself. You can save different pins to your guides or favorites as long as they have different adresses, but if the adress is the same as another pin it either wont save or it will replace the first pin you had. This is a major flaw because as you said sometimes when you save pins outside of cities there are no actual adresses and maybe only a postcode - and in those cases the app will interpret two pins (even if theyre miles apart) as belonging to the same "adress". It would make way more sense if the pin was associated with a coordinate instead of an adress. But even if the pins have vastly different coordinates the app will still think that the pins are one and the same if they have somewhat similar adresses. Clearly the app is programmed from a city/business-centric point of view rather than a nature interested persons point of view!