In short, "behind" the teleporter leads a portal (93.350) in the second part of the snake field, you have to go to the teleporter through the valley on.
To get to the other side of the river follow roughly this way after you're through the portal:
You should ride necessarily because Ogre Butcher and Stone Golems attack by themselves, are fairly quick and cause much damage.
- → straight to the river
- → along the river, as far as it goes
- → Turn left towards
- → at the first intersection, turn right
- → high at the fork to the right the mountain
- → on the other side down and keep right (back to the river)
- → Take a left at the river along the south
- → the bridge is approximately 375.885
In this area you cant access the map but the mini-map is still visible.