What was the last territory in the world to be discovered?

 Determining the "last territory in the world to be discovered" is challenging, as it depends on the context and criteria for discovery. Additionally, much of the world has been explored and mapped over centuries, making it difficult to identify a specific "last" territory.

In terms of remote and uninhabited places, some regions were discovered or explored relatively recently due to their extreme isolation and harsh environmental conditions. For example, parts of Antarctica were among the last to be explored and mapped, with the interior of the continent not being reached until the early 20th century during expeditions like those of Robert Falcon Scott and Ernest Shackleton.

If we consider inhabited regions or territories that were unknown to the outside world until relatively recently, some indigenous communities in remote areas might fit the criteria. Contact with certain tribes in the Amazon rainforest or Papua New Guinea, for instance, occurred in the 20th century as exploration and communication technologies advanced.

It's important to note that the concept of "discovery" can be problematic when applied to inhabited regions, as many places were already known and inhabited by indigenous peoples long before contact with outsiders. The emphasis should be on respectful engagement and recognition of the diverse histories and cultures of these regions.