About the scale thing;
Mauretania is 1 million sq kilometers according to Wikipedia.
Yeah. I used a fan made map before. It was the one that had everything on it.
Using http://i5.photobucket.com/albums/y199/Proweler/Lore/distancemeasured.jpg (green line PGE, red and blue daggerfall as measured in game) for a quick guestimate; Cyrodiil is 1 millision sq miles.
Aww, come on. You were in the thread when I made the measurements before. Granted, it was with a different map. I don't like the map you used there because it skews Morrowind to seem gigantic, but alright. I just made the measurements based on that. Here are the measurements made on that map in square miles.
Cyrodiil = 166,375
Elsweyr = 51,523
Valenwood = 56,524
Black Marsh = 91,156
Morrowind = 147,863
Solstheim = 6,757
Skyrim = 95,547
Summerset Isles = 41,670
High Rock = 55,218
Hammerfell = 104,815
So if I didn't miss a number or something, Tamriel = 817,388. That's 2,117,034 sq km. Around the size of Saudi Arabia.
I don't prefer that measurement though, because the pocket guide information which we're using directly says the peak:
It is a small continent all to itself, riven from the rest of Morrowind by the remains of a colossal crater. On a clear day (an exceedingly rare event), the peak can be seen from Almalexia, 250 miles to the south.
Meaning Tamriel overall is 675,390 sq miles. That's 1,749,260 sq kilometers. That is around the size of Libia.
Cyrodiil = 137,382
Elsweyr = 42,577
Valenwood = 46,713
Black Marsh = 75,327
Morrowind = 122,173
Solstheim = 5,581
Skyrim = 78,950
Summerset Isles = 34,435
High Rock = 45,626
Hammerfell = 86,626
So yes, Tamriel is small, but not that small. Somewhat smaller then the West Europe.
I know it was an estimate and all you made, but based on the Cyrodiil size you guessed, you'll need to divide by 6, or eight if you take the smaller route.