Two Rivers, a Mountain, and a Really Big Tree (PWH)

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Though plenty of gates allow bloods to travel between the Outer Planes (if they know where to look), most planewalkers know a few other ways to get around. In particular, four major planar connections link several planes and allow a more convenient (if somewhat more dangerous) means of travel.
The magical River Oceanus runs through a few of the Upper Planes. Its crystal waters are smooth and calm, as well as unfathomably deep. Sailing down the river is a straightforward way of traveling through and across Elysium, the Beastlands, and Arborea. What's hard for some to understand is that the river's path is neither straight nor regular. It dips in and out of the planes it passes through without warning. There's no use trying to understand it, though; most find that the river's flow takes them just where they want to go without really understanding how. Plenty of merchants use the river to transport trade goods, and many others use it for regular travel, so it's not difficult to hire a boatman to take a traveler along its course. Some folks say that certain creatures that live in the river sing a mystical song. If the music doesn't drive a sod banny, it'll give her some secret of the multiverse.
The River Styx, on the other hand, is not as pleasant or welcoming. Its wine- (or blood-) red, dirty, and oily waters run through all of the Lower Planes in a twisted, aimless path. While its sister river, Oceanus, courses with pure, clear water, one touch of Styx's foul soup and a basher might forget his own name and whole life. Like Oceanus, the path of the Styx is never constant and always unknowable. Sometimes it takes a body straight to his destination, and other times its course meanders through a number of planes. Regardless, more than one blood has spilled the chant that it never takes more than a day to reach a desired location while moving along the Styx. Fewer folks travel by the Styx than by its upper-planar cousin, but the mysterious boatmen called marraenoloths transport anyone for a price.
Mount Olympus, a mountain realm on the plane of Arborea, holds a good number of planar pathways. Caverns within the mountain lead to Gehenna, the Gray Waste, and Carceri, while climbing along its slopes can take a traveler to any number of Prime worlds. As the paths shift into a new plane, a traveler sees a round, colored portal. To see where the path goes, a hasher's got to go through the portal. Luckily most, if not all, of the portals are two-way.
Similar paths can be found on Yggdrasil, the World Ash—a gigantic plane-spanning tree. Its source Lies in the first layer of Ysgard, but the branches and roots spread throughout many planes, layers, and realms—so many that no blood has ever been able to trace them all. The roots and branches are big enough to walk on or climb, and some branches even stretch to prime-material worlds. Yggdrasil seems to far exceed the reach of Mount Olympus, and its paths are more frequently used. Nevertheless, if a body wants to use the World Ash, it's best to have a guide or be ready to do some exploring.