Things I would improve and may do when I have a decent image editing software.

The scan here hides the red and the blue a bit more than I like.

I'd change the labels into a proper fictional language.

I'd make the river more visually traceable.

I'd update the circle words into actual words (in a different made up language).

I'd ensure that some of the lines that got fuzzy during the scan were sharpened and redrawn.