If you swim north from the Swamp of Sorrows, there is no place where you can get into Redridge Mountains.
Nor the unnamed area east of the Burning Steppes.
Nor the Badlands.
Nor the unnamed area east of the Wetlands.
Nor the east side of the Arathi Highlands. A mighty waterfall prevents you from swimming up the river near Thandol Span.
I haven't found a place yet--I think I'm likely to land in the Hillsbrad Foothills.
This was so boring that I hope others can avoid the tedium. I should have hearthed back and tried another route, but I kept thinking 'just a little farther...'