well, i really didn't saw the other teleport on the other side on the first time, but...

I did this:
I went dragon form, then approached the anti-dragon zone over the right side, and then shifted bac to human on a place that i could walk till there, then, after i was in there, i saw the teleporter and walked into it, it took me to the other side of the river.
You can see the teleporter easily from the statue, or from the Yggdrasil tree...

Unfortunately, i just took out the english hack, trying to learn German xD and the game save ain't compatible, best i can try to do is explain it this way.