How to get to The Undershore
The fastest way to reach Undershore is to take the Guild Hall portal to the zone. Alternatively, you can also have a Druid or Wizard port you there. If these options are unavailable to you, you'll need to take the Neriak stone in PoK to Nektulos Forest and travel west into the river to go to Corathus Creep.
Once in Corathus Creep you will need to travel directly west across the zone until you reach Undershore.