The Undershed Sinkhole is a large landmark located in the depths of the Undershed. It is a large hole, surrounded by roots and swarmed with Mosquitos around it. It also has a puddle at the bottom with some Pond Moss and Spiny Water Fleas. The player must travel through this landmark to reach the end of the Undershed. Once inside, the player can progress further in the biome by traveling through the spider cave in the sinkhole, which has one Black Widow.
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