Philostorgius stated the following
in Book 3 as epitomized by Photius according to who Amidon “is usually
a careful, if hostile, epitomizer, and his editorial glosses
can usually be detected”:
"The Persian Gulf, which is formed by the
ocean as it enters there, is huge and is encircled by many nations. The
Tigris is one fo the enormous rivers that empty their streams
into it at its mouth. The Tigris seems to have its source in
the east, south of the Caspian Sea in Corduena, and it flows
past Syria, but when it arrives in the region of Susa, the Euphrates
joins its current to it, and so it boils onward, swollen
now to a great size.”