Just an idea. Oceanus and styx are a thing of the past. In modern age, people build roads and highways. Unfortunately, roads don't always stay where they're built onthe planes, so it's best to pick up an experienced hitch-hiker, if you find one you think you could trust :E
Also, border towns could be connected by a monorail. Wee 
Or reading lolita hentai mangas.
Would air travel be acceptable?
This got me thinking on what the Rivers could evolve into; I'm getting an image of the Styx as a long, convoluted highway which induces an extremely powerful version of highway hypnosis in the unprepared or unwary.
And then you'd then have the marraenoloth cabbies...
Or reading lolita hentai mangas.
...Even though all the good stuff has been edited out by the Bureau of Proper Thought (420 Beezelbub Way, Malagard, Maladomini)
Speaking of highways, does anyone have an idea what the Outlands will be like?
I had an idea involving the Outlands being kind of like the American midwest - fields and highways stretching into space-bending infinity. I never really worked out a good implementation for it, though.
Or reading lolita hentai mangas.
...Even though all the good stuff has been edited out by the Bureau of Proper Thought (420 Beezelbub Way, Malagard, Maladomini)
Why would they edit it out? That sort of stuff is just what they need to get into the mood for the day at the office as a member of the Middle Management of Evil.
I've always imagined outlands as a prarie type of plane. Never knew why :oops:
Wasn't there talk of an Infinate Subway somewhere?
For person travel, the Great Rivers are definately no longer as popular - but for shipping, still one of the most effecient and quickest ways to travel. (Even now, shipping by boat is the preferred method.)
Re: monorail - that actually sounds pretty cool. I can picture a whole line of baatazu commuter workers sitting in a row all doing suduko puzzles.