Checks borders (6)
I believe the answer is:
limits
This clue could be a double definition.
'checks' is the first definition.
(limiting is a kind of checking)
'borders' is the second definition.
The definition and answer can be both locations as well as being plural nouns.
Maybe there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for limits that I've seen before include "Frontiers" , "Bounds beyond which one cannot go" , "Boundaries, confines" , "'Boundaries, demarcation lines (6)'" , "Curtails" .)