Sitting on the confluence of 100 ley-lines has its benefits, and one of them is the ease by which Tolkeen can (and does) make contact with other communities, civilizations and societies. This emphasis upon exploration and diplomacy ensures that Tolkeen has a set of eyes and ears in many places of interest, and because of that fact there is a flow of communication to and from Tolkeen that cannot be equaled by any rival or enemy that is not likewise empowered by supernatural forces. Therefore, despite its seeming location isolation, Tolkeen is actually quite cosmopolitan- at least, on the outside. Within the Inner City, it's far more homogeneous.
As one should expect, the bulk of the city-state's diplomats and explorers are magicians and many of them are members of the so-called "Esoteric Engineers", with an emphasis on the study of social sciences instead of advanced material or life science emphasis, for the purpose of establishing and maintaining relations with those other entities. Given what's written, I would expect Tolkeen to maintain open and more-or-less friendly relations with all of the following (not an exhaustive list):
- The Free State of Lazlo
- The Free State of New Lazlo
- The New Navy
- North America's First Nations ("Look, we don't need to take land to do our thing, so we will gladly help you to retake what's yours and then help you keep it.")
- Psyscape (exclusively through Mystics)
- Tritonia
- Lemuria
- The Druids of England (and, through them, contact into Europe)
- The United Worlds of Warlock (via the Atlantean colony world)
Furthermore, I expect covert operations to be established with the following powers or regions:
- Atlantis (observatory mission, staying out of conflict with Splynn, to maintain access to the Splynn Market)
- Consortium of Confederated Worlds (unsure of them; observor status)
- Transgalactic Empire (dislike them; unsure as to what to do about them)
- China (preparing to intervene covertly to anti-Yama King forces)
- Europe (via Druid allies, figuring out what to do and how to do it)
- Center (as with Atlantis, this is an observer mission to maintain market access)
Tolkeen can get anywhere a ley-line or a nexus point exists. Therefore, its magicians and related agents can go there and return from there. No reason, therefore, not to see things and entities from across existence in Tolkeen.