The Naga River, flowing down from the north, past the foot of Denagoth’s plateau, through Heldann and out into the Western Sea of Dawn, is an interesting conundrum. Why? Because a 50 mile segment of it is often missed out, just before it enters Heldann.
So how did this strange situation come about?
The answer lies in X11’s original 24 mile per hex map of the area:
Here’s my colourised replica of the full map.
Do you see the problem? The Naga River was interrupted by the label for the Mengul Mountains. This was quite common in old black and white maps, where they blocked out the area behind a label to make it readable.
In other words, the chances seem high that the river was originally intended to extend behind the label, connecting both ends together. However, later maps of this area took it at face value. For example, check out the 24 mile per hex from Wrath of the Immortals, which actually added in little black circles to represent tunnels, with this part of the river flowing underground:
Interestingly, the 48 mile per hex map from the same set had it as a normal river:
The Poor Wizard’s Almanac series showed the river with tunnels and part of it underground.
So to sum things up, we have two versions, one with a normal river, the other with part of the river going through an underground tunnel network through the mountains.
Which do you prefer?
Despite the origin of the tunnel system in an error, I’m inclined to go with it, since it seems more interesting.