Where do you plant the new Tree?

You have just secured a vial of the Sun Well and also currently possess a World Tree Acorn.

You’re going to surprise the Night Elves (and the whole of Azeroth) by making a new magic font for them (a la Illidan for the Highborne) and plant a world tree in it/around it. The Aspects are sure to bless these creations and endeavors; the owe you. You have any number of folks to assist.

Where do you set this up?

Serious consideration: Desolace (post cata) or Feralas.

Best Consideration: Beneath the Sun Well. Just to mess with the Blood Elves.