a barren land
The term is "landless."
It means the land without people.
People have sky dived without working parachutes and lived. It depends on how you land and what you land on.
The term for people who surrendered their land to a lord in return for protection was "vassal." Vassals would promise loyalty and military service to the lord in exchange for the use of the land.
You can find an ocean without water on a map or a globe. Similarly, you can find land without people in remote, uninhabited areas like deserts, mountains, or certain islands.
Tangata whenua is a Maori term from New Zealand that translates to "people of the land." It refers to the indigenous people of the country who have ancestral ties to the land and hold a special connection to it.
A Parcel of Land is the correct term.
They are typically referred to as squatters or land invaders.
The common term for measuring land is surveying.
Accusing people of disloyalty without proof
a name given to a nation of people without a land to legally occupy
a land mass is term used to describe thes type of land.