Ok I'll do the easy ones
Cyrodiil-True Modern North America
Slightly old Rome

High Rock and Orsinium-England-Ireland

Skyrim-Germany considering Atmora as Russia.

Black Marsh-South America(amazonian region)

Hammerfell-Middle East

Elsweyr-Possibly India Geographically as it has a lot of diversity(this is tough one)

Now you guys do the tough ones
There's 1.Morrowind
2.Smmerset Isles
3.Valenwood
4.Akavir
5.Pyandonea
7.Atmora
I'm not trying to piss people off this is purely acedemic..I hope it's treated as such.

Having seen this scenario play out a thousand times, I can tell you that people will probably be annoyed and will give you the correct answer which is that you can't accurately draw clear-cut parallels between singular Nirn civilisations and singular Earth civilisations. One example, Nords might look like Vikings, but they mummify their dead.

Valenwood - One of the deadly swamps in Europe

We have deadly swamps?