The Winter Wastelands are the last "real" area in Pikmin 3:Return to the Pikmin Planet. It is also the hardest, with the toughest enemies, caves, bosses, and hardest to get treasures you'll ever see. It appears to have formerly been a road next to a sidewalk, like the Valley of Repose and somewhat like the Desert of Wrath. You can unlock this place by paying 18,000 pokos of the thieves holdup money, or 90%. Good luck!