1.
No-man’s land is an area of land that is not owned or controlled by anyone, for example the area of land between two opposing armies.
In Tobruk, leading a patrol in no-man’s land, he was blown up by a mortar bomb.
...the no-man’s land between the Jordanian and Iraqi frontier posts.
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2.
If you refer to a situation as a no-man’s land between different things, you mean that it seems unclear because it does not fit into any of the categories.
The play is set in the dangerous no-man’s land between youth and adolescence...
N-SING