[The Ninth Valar]

I've wondered for a while about the location of Beleriand in relation to the 'current' Middle-Earth. I look at the Blue Mtns and wonder which segment of the old mountains they were, where the east-west rivers that ran through Ossiriand came and where exactly the Grey Havens would have been before the War of Wrath. I have yet to find a map or series of maps that shows the transition from Middle-Earth + Beleriand to what we know of as the Hobbit/LotR era M-E; I can't even find one that shows the lands past the edge of the published maps in LotR.

So my question is simply where was Beleriand in relation to the current M-E maps? It niggles at the back of my mind.