Bucolic couple of rivers (5)
I believe the answer is:
rural
'bucolic' is the definition.
(similar in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for rural that I've seen before include "Countryfied" , "Countrified" , "Characteristic of the countryside" , "Connected with farming" , "outside the city?" .)