The Tropics is a biome that was added on January 22nd, 2016, along with the rest of the January Mega Update. This biome contains Link's Logic, Fine Arts Shop, The Maze, the Maze Ledge, the Bird Cave, Cavecrawler Wood, Koa Wood, Birch Wood, and Elm Wood. The two ways to get here are by Hoover's Ferry, which costs $400 Money each way, and by longplanking, with the latter not suggested.
This biome is quite unique because its mountains and rocks feature a gray color, in contrast to the brown mountains everywhere else in Lumberland. These grey cliffs extend fairly far and create a notable peninsula named the Tropics Peninsula near the coast of the Tropics. While many players consider this an island, that is truly incorrect because of the line of cliffs that connects the Tropics to the Ocean Cove.
Its grass maintains a considerably bright green that extends throughout the entire biome. Unlike most biomes, the shores of this biome contain sand that slowly descends into the Ocean making it look like the Sand Dock in the Main Biome.
The Tropics currently has two stores: Link's Logic and The Fine Arts Shop. Link's Logic is located at the end of the paved road, at the section of the road that looks similar to that of a parking lot. This store sells logic gates and wiring items. Meanwhile, the Fine Arts Shop is located within The Maze and sells paintings.
On January 13th, 2019, the Bird Cave was introduced into the game. This cave was located not far from Link's Logic and was located on a ledge that was low enough to the ground that a player could boost them self up with a truck onto it, and proceed to the cave. The cave was rather small, at the end containing the Bird which could enchant a player's Silver Axe into the Bird Axe after following the instructions that were written on a small tablet located near the entrance of the cave.
The cave is now blocked off with a boulder. There is only the exception of a wall-clipping glitch to get into the cave or else it is unaccessible due to the boulder in front of it. Keep in mind that the wall-clipping method is a one-way method as there is no known method to getting out of the Bird Cave after doing the glitch.