The Tree Maze is not the same as the Wall Of Trees. The Maze has an interior, the Wall does not.
The center of the maze contains the ruined MariRangers Guild Hall. This forms the entrance to a dungeon, commonly referred to as the MR.
The maze is actually on the northeast shore of a river, which flows northwestward from the source of the three rivers, down to its mouth between Duldrus and Marali. The usual approach to the maze is from Mirith. A Stone Golem is usually found just West of the river's West passage, among the trees, that apparently "safe" far side.
Where is the exact location? A player, lacking familiarity of this Tree Maze, should not seek its location, except to join a group of players who has this familiarity.
Personal note from Iceane:
-Don't pet the Forest Dragons.