While rereading the Silmarillion, I've been having some fun contrasting maps of Middle-Earth during different ages (found just by Googling.)

I noticed something odd. Consider this map of the First Age:

First Age Map http://www.elvenesse.net/maps/Arda_FirstAge.gif

One can see the ruins of Utumno in the middle of the Iron Mountains in the north.

Now take a look at this map of the Second Age:

Second Age Map http://www.tolkiensite.narod.ru/maps/second_age/the_second_age_of_arda.gif

Here Beleriand has sunk into the sea, but one can still trace the line of the Iron Mountains, with a hill in the north of Eriador roughly in the same location as Utumno, east of the Ice Bay.

Now compare that spot with a map from the Third Age:

That hill appears to be the site of Carn Dum, the capital of Angmar.

My question, with a few follow-ups:

• Did JRRT or CT ever indicate in writing that these sites were geographically close?
• If so was the proximity intentional?
• Does anyone recognize the first two maps or can say anything about their authenticity (or lack of)?