Gold-rush region over there involving us (5)

I believe the answer is:
yukon
'us' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'gold-rush region over there involving' is the wordplay.
'gold rush region' becomes 'uk' (I am not sure about this - if you are sure you should believe this answer much more).
'over there' becomes 'yon' (archaic word meaning 'over there').
'involving' indicates putting letters inside.
'uk' put into 'yon' is 'YUKON'.
Can you help me to learn more?
(Other definitions for yukon that I've seen before include "Canadian region" , "North American territory" , "Canadian territory, famed for the 1897 gold rush" , "North American banker" , "NW Canadian territory" .)
