So is Themyscira in the North Sea or the Mediterranean?

Because I always thought it was near Greece.
But there's no way that that little boat made it to England in one night.
Because there's the little problem of Europe.
Unless it was a magic boat, like the ones from Avalon.
Maybe Themyscira is Avalon.
If so, does Oberon know the Amazons are there?
Are they his children, too?
Or is he going to get mad and do things, again?
And if it is Avalon, those weird sisters sure aren't very good at keeping out the riffraff.

(Do you think the Amazons ever met the gargoyles and the Scots?)