I get the itching feeling that this was already discussed more than once, but I didn't find it on the first 3 pages so I went ahead with this thread. Going by the landmass of Daggerfall, Illiac Bay is roughly the size of Great Britain, right? Since Illiac Bay comprises both Hammerfall and High Rock than High Rock itself should be the size of England plus Scotland. The comparison is adequate because High Rock has both rich low lands throughout the peninsula, but it also has the less populated highlands in the eastern mountain range.
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