The Deadzone in Biomutant is a Biome, where the all the Antaki Ouposts are. On the Northwest you may find the Jumbo Puff Place, where Jumbo Puff can be found. But you'll need the Mekton to defeat it, which can also be obtained by completing the Main Quests that take place in this biome too. Hypoxia Zones are common in the Deadzone.
You can find a list with all the Locations in the Deadzone Biome below.