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Languages: Elven and Common
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Brigandage:
When the gods created the Fifth World, they designed the Feywild and the Shadowfell as direct, 1:1 mirrors of the Material Plane. As you said, "plane shift in the ocean... you are on the water there as well." This was done to keep the planes in sync.
The gods faced a massive cosmological problem: these three mirrors, left unbound, would eventually "drift" or "de-sync," tearing the fabric of reality apart. They needed a way to latch the three planes together, permanently.
Their solution was The Fringe.
They chose a specific, 320-mile-wide by 130-mile-deep region of Aethelion, located at the southern bottom of Gelf Lake. In this precise area, they fused the three planes, creating a "Planar Hub" where all three realities overlap and are anchored to one another.
The Barrier:
To protect this critical, world-bending "engine," the gods encircled the East, South, and West sides of the region with a "Dimensional Wall" (the "impassable barrier" from File 1). This wall is not a physical structure, but a shimmering, invisible field of divine force.
Travel:
This divine "latching" had two side effects:
The "Tears": The barrier is so thin and stressed in this region that mortals are constantly tempted to "create tears" in it, hoping to find a shortcut that would "cut weeks of travel time." As you said, this is incredibly dangerous, and anyone who has tried has not been heard from again.
The "Gate" and "Axis": The Northern border was left open, creating the one and only stable "gate" or entrance into this planar-fused zone from the Material Plane. Once inside, a traveler can move on the "North-South Axis," which is the only stable, known path for crossing between the Material, Fey, and Shadow mirror-regions.