Towny has an integration for webmaps that generates a link for the map with the x and z coordinates. This works properly, except for the world name. Towny provides the Bukkit world name, but squaremap expects the Minecraft name. Ideally, there would be a way to redirect to the corresponding one (e.g. map/?world=world_nether becomes map/?world=minecraft_the_nether).

I think a better solution here is for the Towny integration to allow using the world key (namespace and value separately) in the link format. squaremap doesn't use Bukkit names for anything, it doesn't make sense to add it here, especially when world:nether is also a valid world key, for example.