I believe that it is more valuable to study the unknown than to try to compare it with the known.
I conducted this research on my own, which means I may be wrong or may know something.
In general, I tried to study the Rosettes from the manuscript as a map of some geographical object. My goal was to understand what could be depicted if it were a map. Here's what happened:
Explanations:
1). Despite the fact that the top-left rosette looks like the central rosette, it is not an island. According to the island's logic, there should be a bridge on the right side to connect it to the top rosette, but we only see it from the bottom. There is a yellow area around the "core" of this rosette, which is not present on the island. There's something that looks like a square on the right, and a rock on top, which leads me to believe that the rosette is "grounded" and directly connected to the upper rosette. In summary, I decided that the logical meaning for this Rosette is the designation of a mountain.
2). Temples are similar structures. They are called temples because of their resemblance (lines resembling columns extend from the corners of these "stars"). One might assume that the upper and lower temples are like poles or "Wind Centers," but then one wonders why the left rosette looks like them. It seems to me that similar shapes have similar meanings. In my opinion, these may not be temples, but they are important sites for the city.
3). Lake/Source - of course, it's actually challenging to determine what this is in terms of geography, but it's possible that it's a lake or perhaps multiple lakes. Firstly, the spotted pattern resembles lakes from a bird's-eye view. Secondly, the abundance of blue color and the intricate shapes below make sense in this context. It is also possible that the "cloud" in the center is a lake, and the shapes below are canals.
4). Strait and Waterway - if you look at their "scales", you won't immediately know what the pattern means. But look at the Bridge, and you might notice that there's a shoreline, a "rise in the ground," and something like water. Based on this difference, we can assume that the paths on the right-hand rosettes are simply water or waterways. This fits in with the fact that the Right Rosette represents the Sea - no one would build a bridge to the sea.
5). The sea is because the pattern of this Rosette is different from others in that it has sea colors and no architecture. Notice that fish tails emerge from the central flower, there's nothing else there. The available data is best explained by the fact that this is a sea.
But why not the lake? If this is a lake, it's unclear where we should place the Central Island, and the overall appearance of the city seems strange.
6). Main Cities - Outlets that are full of urban architecture (the upper one has castles, and the lower one has something like palaces).
My assumptions:
1). The scale of this map is two cities at most. It doesn't look like much more.
2). The map is obviously not a navigation map, but an schematic one.
3). The city looks quite typical, and there are no special attractions.
4). The map doesn't have an exact proportion, and it doesn't strive for it.
5). The map has a certain horizontal symmetry: City opposite City, Temple opposite Temple, natural object opposite natural object? (well, it could be a game of opposites - mountain-lake).
6). The map looks more figurative than geographical. One explanation for this is an attempt to distort the map beyond recognition.
7). The text around the Rosettes has a beginning (represented by a notch), so I believe that the text is encoded here, rather than any words or numbers.
Roughly, the proposed city would look like this (sorry, I can't draw cities in Paint):
The river appeared because you can also see waves to the left of the Bridge, and the Island and Sea rosettes give a river when translated into a readable map.
Of course, because of the presence of the tower at the Lakes, it can be assumed that these are two different cities on the two banks of the river, but they share a common architecture (i.e., both have ghibelline crenellations) and a common structure (the city and the "temple"), which leads me to believe that they are one city built on the river.
I might be wrong, and if I am, please tell me!