I have posted another maps resource, European Network Maps, in which I collect and maintain links to the publicly available maps of European network providers. In this case, my criteria are those spanning markets in at least 5 countries - smaller and more regionally focused networks will be collected on another page. While I keep tabs on the European fiber and data market as best I can, I obviously know less about it than that of the USA and there are certainly going to be networks I have missed - big ones perhaps.
So consider this (like all such resources on this website) a work in progress. Of course, none of this is earth-shattering - it's just that when I want to find such maps I wind up having to hunt hard for them and often retrace my own forgotten footprints. For much more comprehensive data, one can always pay a service like Telegeography, but if you just want to find out (or refresh a memory about) who goes where then this list of maps is free. Still to come will be some sort of collection of undersea cables, regional and local map resources in both the US and Europe, and who knows maybe some information from Asia or South America although that gets harder. All map collections are now located under the 'Resources' menu in the top menubar.