The borderlandbetween two things is an area which contains features from both of these things so that it is not possible to say that it belongs to one or the other.
...on the borderland between sleep and waking.
2. countable noun [usually plural]
The area of land close to the border between two countries or major areas can be called the borderlands.
...Lebanon's southern borderlands.
borderland in British English
(ˈbɔːdəˌlænd)
noun
1.
land located on or near a frontier or boundary
2.
an indeterminate region
the borderland between intellect and intelligence
borderland in American English
(ˈbɔrdərˌlænd)
noun
1.
land constituting or near a border
2.
a vague or uncertain condition that is not quite one thing or the other
Examples of 'borderland' in a sentence
borderland
That was where I now stood: at the borderland between sacred ground and secular; between Barbarossian territory and the rest of the world.
Clive Barker GALILEE (2001)
A mystical borderland had been passed and Hart, for the first time, knew himself, and in so knowing, tasted wisdom.