This is unknown, because only the Greeks wrote about their myths at that time.
Greek myths come from the country of Greece.
Myths are stories that come from legends passed down through the ages.
In most myths, I think they come from Ireland.
the Greek philosophers
Without science, they relied on myths to explain how the wolrd had come about and what it was that made it work.
Nowhere; unfortuneately giants are myths.
Greek and roman myths
There are a lot of myths about them so they come from a lot of places, but they do have their own world, so they come from there.
Ancient greek,they were part of there myths.
In Europe. The land where most myths come from.
There are very few myths about Morpheus, though I have come across a few. If you search hard enough, you will find them.