If we can determine the position of these three, that of the others will follow, at least within certain limits.
Now Arzanene was certainly on the left bank of the Tigris.

It adjoined Armenia, and is reasonably identified with the modern district of Kherzan, which lies between Lake Van and the Tigris, to the west of the Bitlis river.

All the notices of Arzanene suit this locality; and the name "Kherzan" may be regarded as representing the ancient appellation.
Zabdicene was a little south and a little east of this position.

It was the tract about a town known as Bezabda (perhaps a corruption of Beit-Zabda), which had been anciently called Phoenica.

This town is almost certainly represented by the modern Fynyk, on the left bank of the Tigris, a little above Jezireh.