The British Astronomical Association's Mars Section has some interesting maps of Mars based on ground-based telescopy.

Shiro Ebisawa'a excellent three-part map uses the old classical names (Nix Olympica, Mare Acidalium, etc).

Many of the names on this map, however, are the old names of canals, which of course don't actually exist. So why are they still there? Are there observable albedo features corresponding to Ister, Nepenthes, Uranius, Gigas, etc?

One other point, while I have your attention. The two dark "forks" projecting from Sinus Meridiani are labelled Fastigium Aryn and Fontis Valkyrii. The former I've heard of before, but the latter is new to me. Googling gets no hits. I thought perhaps that the name ("The Valkyries of the Fountain") was incorrect for Valkyriorum Fons ("The Fountain of the Valkyries"), which sounds more Martian; but this too gets no hits on Google!

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A brief note: Sinus Meridiani was originally christened as "Dawes Forked Bay". That name was dropped in favor of "Meridian Bay", by the German astronomer Joahann Maedler, after choosing it as the origin of areographic longitudes. The Latin form was first adopted by E.M. Antoniadi.

Source: Encyclopedic Dictionary of Astronomy and Astronautics (printed medium) - by Prof. Ronaldo R. F. Mourão.

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