I am going to move in your direction, but not all the way! Because I am stubborn. 1) Fair point that the Romans already considered the Danube to be, well, Roman! 2) You've convinced me that the canal was a huge part of his taming the Danube to allow for more substantial trade, but I do think there are other aspects to this, including his construction of the bridge, the riverside road, and the many fortresses & ports including the Diana fortress which controlled the entrance to the canal... or do you consider that to be "part" of the canal? At least one source also says that Trajan enhanced the river fleets too! All of this would contribute towards making the Danube a safe, navigable, tradeworthy route and something for Trajan to celebrate on his coins. So I would suggest the coin represents the taming of the Danube (primarily for the purposes of trade, that's what I meant originally), with the canal representing a large portion of this achievement... but not all of it. If he wanted a coin to represent the canal specifically, then why not name and depict, well, a canal, for pete's sake? Let me reiterate how wonderful your writeup is though. And I'm fully prepared to acknowledge that you're more likely to be right due to greater expertise! Well done, sir! I look forward to your next one, which I understand may also feature the Danube to some extent.