Not far off are mineral springs by the coast (Neptuniae aquae), known to the Romans and still in use - except one containing arsenic which was blocked up both by the ancients and again in 1839 as a precaution.
He was the author of the De mensura orbis terrae, finished in 825, which contains the earliest clear notice of a European discovery of and settlement in Iceland and the most definite Western reference to the old freshwater canal between the Nile and the Red Sea, finally blocked up in 767.
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