Wolfland
Wolfland was a spruce forested area in Season 1 owned by Unnatwain. It's uncertain whether Wolfland was a continent or a country or a non-political territory as the lines between the three were most often blurred in Season 1.
The overworld Great Ice Bridge passed above a large hole built in Wolfland in order to connect Cuba and an intersection between the Artipelago and a mining area.
Wolfland Hole
Wolfland is known for having a giant hole that they dug into it for unknown reasons. The hole was the only structure built in the area apart from the Great Ice Bridge. Given the hole's rugged landscape, it is likely to have been unfinished. The hole contained some unknown redstone contraption and an obsidian platform in its center. It was mostly unlit and held Unnatwain's chests at the very beginning.