The Lost Wilderness (Japanese: みかいのこうやUndeveloped Wilderness) is a dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It is unlocked by accepting a ☆5-rated job with "???" as the location in Explorers of Time and Darkness, or by finding it on the bottom of a glass in Spinda's Café in Explorers of Sky. It consists of 18 floors and has a Deluxe Box and a Warp Zone on the last floor.
On the 15th floor is a locked room with a Reviver Seed. Unlike other locked rooms, however, after being unlocked, it remains unlocked for the rest of the game. A similar room can be found in Happy Outlook.
