Probably the Pelusiac branch of the Nile.
I tried, I really did, to check that out, and found this much more interesting tidbit:
[snip] Among the objects excavated from a number of Silla royal burials were foreign-made luxury goods, notably more than thirty Roman-style glass vessels. Found in tombs dating to the fifth and sixth centuries, they attest to the continuing importance of Mediterranean glass in international trade at that time. [/snip]
(this isn’t Silla the Roman fort in the Sinai, it’s Silla the kingdom in what is now Korea)