I have cities, but no houses I have mountains, but no trees I have water, but no fish I have roads, but no cars What am I

In a land of wandering, I point the way, a needle's dance upon my face, guiding lost feet with silent grace.

A region in Europe I am from, to the rest I could say wine for everyone.

Floating through untamed waters with all the shades of blue, Beware of my titanic strength. I am still, but deadly too. I’m a metaphor for things unseen unless you take a dip, because there’s more to me beneath the surface, but this is just the tip.

I’m a note to a friend and a national monument, but I fit within an envelope. What am I?