Inside the Deku Tree is the first dungeon in The Legend of Zelda: Ocarina of Time, and therefore the first 3D dungeon in the Legend of Zelda series. This dungeon continues a trend in Zelda games of the first dungeon being forest themed. It is also the second dungeon to take place inside of a tree, the first being Level 1 of The Legend of Zelda. However, that dungeon was presumably a dead tree, so this dungeon is also the first to take place in a living being.